RSI Experts

Risk Sciences International is staffed and supported by a team of highly motivated and qualified risk experts working across multiple sectors of global society. All three teams — Senior, Staff, and Associate Experts — provide RSI clients the sound, evidence-based support that is needed during the most difficult times when lives and livelihoods are at risk.

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RSI CEO Greg Paoli

Greg Paoli

CEO, Principal Risk Scientist

Greg Paoli earned both his Bachelor’s and Master’s degrees from the University of Waterloo, specializing in engineering and systems design. His early career involved diverse research projects at the University of Waterloo’s Institute for Risk Research. Greg later founded Decisionalysis Risk Consultants in 1997 and co-founded Risk Sciences International in 2006. He has served on multiple high-profile committees, including those under the U.S. National Academy of Sciences. As CEO of Risk Sciences International, Greg focuses on risk-based regulatory transformations and has developed enabling technologies like FDA-iRISK. His work spans various sectors, from food and chemical safety to public health, and he continues to contribute to the advancement of risk-based decision-making methodologies.

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Daniel Krewski, RSI Chief Risk Scientist

Daniel Krewski

Chief Risk Scientist

Daniel Krewski began his career in the federal government of Canada, focusing on programs within Health Canada, particularly in food safety and environmental health. Trained in mathematics, statistics, and biostatistics, his multidisciplinary background reflects the complex nature of risk science. He later transitioned to academia, founding the McLaughlin Centre for Population Health Risk Assessment at the University of Ottawa. There, he developed new methodologies and collaborated internationally. In 2006, he co-founded Risk Sciences International, aiming to provide expert advice on diverse risk issues. His contributions have been instrumental in shaping risk assessment frameworks used by organizations like Health Canada and the U.S. Environmental Protection Agency. In 2023, Dr. Krewski passed the CEO’s baton to Greg Paoli; he remains active as RSI Chief Risk Scientist.

Daniel Krewski's profile >>
RSI Expert-Don Mattison

Donald Mattison

Chief Medical Officer, Senior Vice-President

Don Mattison’s career is an amalgamation of medicine, science, and public service. He started with a Bachelor’s degree in Chemistry and Mathematics, followed by a Master’s from MIT in Chemistry. He then pivoted to medicine, obtaining an MD from Columbia University and focusing on pharmacology and toxicology in reproductive health during his residencies. Mattison has held several prestigious appointments, including Dean of the University of Pittsburgh’s Graduate School of Public Health and Chief Medical Officer at Risk Sciences International. Throughout his career, he obtained medical licenses in six U.S. states and served in the U.S. Public Health Service, retiring with the rank of Captain. Most recently, he became a Distinguished Professor of Epidemiology at the University of South Carolina.

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RSI VP Cemil Jim Alyanak

Cemil ‘Jim’ Alyanak

Vice-President Communications and Strategic Initiatives

Cemil ‘Jim’ Alyanak has had a lifelong commitment to the field of communication, which has included multiple high-profile global campaigns. His professional focus has centered on development, humanitarian, and environmental projects, with a particular emphasis on risk and crisis communication. Over the years, Alyanak has collaborated with prominent figures like Presidents and CEOs, often in response to urgent public health and humanitarian crises. Despite his high-profile collaborations, he remains committed to grassroots projects in challenging locales such as conflict zones and slums. Prior to joining RSI, he led a global public interest communications group and has also invested time in publishing and teaching his theories on communication and perception.

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RSI Expert-Emma Hartnett

Emma Hartnett

PhD, BSc
Practice Lead, Risk Modelling and Simulation

Emma Hartnett is an internationally recognized expert in risk assessment, specializing in toxicological, microbiological, and nutritional hazards. She holds a B.Sc. in Microbiology and a Ph.D. in Statistics and Modelling Science, where her thesis work focused on quantitative risk assessment for campylobacter infection from chicken. Hartnett has developed a variety of decision support tools addressing issues from infectious diseases to bioterrorism preparedness. She frequently contributes to WHO and FAO initiatives, and has been selected for the Joint FAO/WHO Expert Meetings on Microbiological Risk Assessment Roster of Experts for 2018-2022.

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RSI Expert-Todd Ruthman

Todd Ruthman

Practice Lead, Risk Management Technology

Todd Ruthman graduated from the University of Waterloo in 1992 with a BASc in Systems Design Engineering. This educational background instilled in him a fascination for understanding the integrated interactions among people, nature, and technology. For nearly two decades, he has been applying this multidisciplinary perspective in the development of science-based and risk-based solutions for clients. His team specializes in creating IT solutions that support risk-informed decision-making, utilizing either custom web applications or off-the-shelf software such as Excel, Analytica, and R.

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RSI Expert Franco Momoli

Franco Momoli

PhD, MSc
Practice Lead, Chemical and Product Safety

Franco Momoli transitioned from animal sciences to become an epidemiologist and biostatistician. Initially intrigued by human aging and Alzheimer’s Disease, he later focused on cancer etiology and innovative statistical methods. As a professor at the University of Ottawa, he mentored graduate students and led multinational studies. He also worked at research institutes in Ottawa, contributing to diverse clinical research. Currently, he is the Practice Lead for Chemical and Product Safety at Risk Sciences International and an adjunct professor. His work spans from assessing environmental contaminants to innovating public health approaches in chemical management.

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RSI Expert-Anne Wiles

Anne Wiles

Senior Analyst

Anne Wiles joined Risk Sciences International with a background in English literature and human geography, focusing on risk perception and communication. She has worked on public and government approaches to complex technologies like nuclear power and genetically modified foods. At RSI, Anne develops communication strategies on health risk issues and delivers training on risk communication. She also teaches university courses on societal risk concepts and risk management in government, leveraging her expertise in language and risk matters.

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RSI Expert-Jennifer Go

Jennifer Go

MSc, BHSc, PhD Candidate
Risk Analyst, Epidemiologist

Jennifer Go holds a BHSc in Health Sciences and an MSc in Epidemiology, both from the University of Ottawa. Her academic work has spanned epigenetics, mental illness, and environmental exposures. Joining Risk Sciences International in 2017 as a Risk Analyst, she specializes in epidemiology. Jennifer’s skill set includes systematic reviews, data manipulation, and statistical modeling. She has worked on diverse projects, ranging from pharmacoeconomic evaluations to analyses involving large datasets and electronic health records.

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RSI Expert-Nataliya Karyakina

Nataliya Karyakina

PhD, MSc, BSc
Senior Toxicologist, Health Risk Analyst

Dr. Nataliya Karyakina brings extensive expertise in toxicology and risk assessment to RSI. With a Ph.D. in Toxicology and experience at the McLaughlin Centre for Population Health Risk Assessment, she specializes in evaluating health risks from exposure to various toxic agents. Her research spans essential and toxic metals, pharmaceuticals, and nanomaterials. She has contributed to projects on chemical classification and labeling, as well as health-based regulatory guidance. Currently, she focuses on the health effects of engineered nanoalumina and diagnostic criteria for occupational manganism.

Nataliya Karyakina's profile >>
Paul  Stanish

Paul Stanish

PhD, BSc
Risk Analyst

Paul Stanish holds a B.Sc. in Chemistry from Carleton University and a Ph.D. in Chemistry and Nanotechnology from the University of Waterloo. His doctoral research focused on energy movement in semiconducting oxides. Paul has experience in analytical chemistry and has developed Android applications for risk management in options trading. He joined Risk Sciences International in 2021, focusing on leveraging emerging tools to modernize client understanding of risk and streamline data culture.

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RSI Expert-Natalia Shilnikova

Natalia (Natasha) Shilnikova

Senior Health Risk Analyst

Natalia Shilnikova earned her medical degree and a PhD in Medical Sciences, focusing on epidemiology related to nuclear facilities. She moved to Canada in 2007, joining the University of Ottawa McLaughlin Centre for Population Health Risk Assessment. Since joining Risk Sciences International in 2011, Dr. Shilnikova has worked on projects involving toxicology, epidemiology, and human health risk assessment, including systematic reviews and toxicity profiles for various chemicals and drugs. She has also contributed to post-approval surveillance of novel cancer drugs.

Natalia (Natasha) Shilnikova's profile >>
RSI Expert-Margaret Wilson

Margaret Wilson

MSc, BSc, BEd
Risk Sciences International

Margaret Wilson holds a BSc, BEd, and MSc in Molecular Biology, with post-graduate certificates in Population Health Risk Assessment and Management. She has worked extensively in health risk research, from BSE risk management to foodborne hazards. Currently at RSI, her focus includes risk prioritization and addressing challenges related to climate change. Margaret’s multidisciplinary background equips her to tackle complex risk issues effectively.

Margaret Wilson's profile >>
RSI Expert-Shintaro Hagiwara

Shintaro Hagiwara

PhD, MSc
Risk Analyst, Statistician

With a B.Math, M.Sc, and Ph.D in Statistics from Carleton University, Shintaro Hagiwara specialized in optimal design for quantitative high-throughput screening and a value-of-information framework for regulatory decision-making. He honed his communication skills through teaching and consulting roles at Carleton. Since joining Risk Sciences International in 2023, his focus has been on applying the VOI framework and developing health-based guideline values for chemicals.

Shintaro Hagiwara's profile >>
RSI Expert-Hong Duan

Hong Duan

Systems Analyst 2, Application Development

With a B.Sc. in Computer Science from the University of Ottawa and over a decade of experience, Hong Duan specializes in database-driven web projects. A Microsoft certified .NET developer, she previously worked at Wireless Werx Inc. Since joining RSI in 2011, her expertise has contributed to high-quality software development for clients like the Public Health Agency of Canada, the U.S. FDA, and international organizations such as FAO and WHO.

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RSI Expert-Rosanna Wong

Rosanna Wong

Junior Risk Analyst

Rosanna Wong holds a B.Sc. in Environmental Science from the University of Waterloo, with diverse co-op experiences ranging from aquaculture research in the Netherlands to botany collections in Canada. She transitioned into risk analysis, initially as a Junior Analyst at Risk Sciences International, focusing on food safety and public health. Currently, she conducts research on food safety, transportation, and climate change, and leads the development of a climate resilience tool that integrates both qualitative and quantitative data.

Rosanna Wong's profile >>
RSI Expert-Michael G Tyshenko

Michael G. Tyshenko

Senior Health Risk Analyst

With interdisciplinary training in Life Sciences, Public Health, and Public Administration, Dr. Michael G. Tyshenko specializes in health risk communication and policy. He collaborates globally on infectious disease research, including SARS, MERS, and COVID-19, and leads chemical peer reviews at Risk Sciences International (RSI). His work also extends to pandemic planning in Nepal, focusing on drone delivery of medical supplies to remote areas. Tyshenko’s expertise is sought by various government departments in Canada and abroad.

Michael G. Tyshenko's profile >>

Paul Price

PhD, MSc, BA, AA
Senior Analyst

With 45 years of experience in exposure and risk assessment, Dr. Paul Price has worked with diverse organizations, including the U.S. EPA and Dow Chemical. Specializing in mixture risk assessments, he is an adjunct professor at the University of Iowa and serves on the European Food Safety Authority’s committee on combined exposures. A prolific author, Dr. Price is currently focused on publications concerning mixture risk assessment and the Mixture Adjustment Factor.

Paul Price's profile >>
RSI Expert-Martin Leblanc

Martin LeBlanc

Business Development Officer

Martin LeBlanc specializes in business development at RSI, focusing on client needs across various sectors including health, nuclear, and aerospace. With a background in electrical/mechanical technology and sales, he excels in assembling project teams and navigating complex procurement processes. He is adept at contract negotiation, proposal development, and is well-versed in Government of Canada procurement vehicles. Martin is also experienced in international projects and adapts quickly to new procurement processes.

Martin LeBlanc's profile >>
RSI Expert-Monique Macdonald

Monique Macdonald

Office Administrator

Monique Macdonald brings 35 years of experience in office management and financial administration to her role as Office Administrator at RSI. Specializing in stakeholder liaison, data management, and bookkeeping, she also supports sales, marketing, and workshop administration. Monique holds a diploma in Business Administration and Accounting and has a background in both aerial surveying and industry association firms. Additionally, she serves as RSI’s Alternate Security Officer for federal government contracting services.

Monique Macdonald's profile >>
RSI's Sean Hart

Sean Hart

Budgeting and bookkeeping

With 20+ years experience in accounting and 12+ years experience in web development, I spend half of my time as a finance officer and bookkeeper. The other half of my time is spent coding, deploying, consulting and maintaining a variety of management web applications.

Sean Hart's profile >>
RSI Expertise

William Leiss


Dr. William Leiss held the NSERC/SSHRC Research Chair in Risk Communication and Public Policy at the Haskayne School of Business, University of Calgary, from 1999 to 2005. He has a substantial consulting background, collaborating with industry and various Canadian government departments on risk communication, risk management, public consultation, and multi-stakeholder consensus-building processes. Dr. Leiss has provided expertise on diverse issues, including pesticides, toxic chemicals, tobacco, prescription drugs, electric & magnetic fields, and genetic engineering. He earned his PhD from the University of California at San Diego.

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Calvin Willhite RSI associate expert

C. Calvin Willhite


Dr. Calvin Willhite is a renowned expert in developmental toxicology and quantitative structure-activity relationships, with a substantial publication record. He has played key roles in influential organizations and committees, including the National Academy’s Committee on Toxicology, the U.S. EPA’s National Advisory Committee, and the IARC Cancer Chemoprevention Panel. Dr. Willhite is a member of the Society of Toxicology and is featured in notable biographical publications. Currently, he serves as an Associate Expert with Risk Sciences International, contributing to health risk assessments for various chemicals, both man-made and naturally-occurring.

C. Calvin Willhite's profile >>
RSI Expertise

Syed A. Sattar

PhD, Dip. Bact

Dr. Sattar, with nearly five decades of research experience, specializes in microbial pathogens, their environmental influence, and safe technologies for combating infectious agents. His research delves into how pathogens survive and spread via water, food, air, waste, and surfaces. Funding for his work comes from peer-reviewed sources and research contracts. He offers expertise to national and international agencies and the private sector. With an extensive publication record and over 350 invited lectures worldwide, Dr. Sattar’s contributions to the field are substantial. Notable works include the 2013 reference text “Principles and Practice of Disinfection, Preservation & Sterilization” (5th ed; Wiley-Interscience). He’s received several professional honors, including the M.S. Favero Lectureship, Lifetime Achievement Award, and the Hygieia Gold Medal.

Syed A. Sattar's profile >>
RSI Expertise

Melvin Andersen


Dr. Andersen’s illustrious 45-year career in toxicology and risk assessment includes key positions such as Chief Science Officer at The Hamner Institutes for Health Sciences and Professor of Environmental Health at Colorado State University. His significant contributions include developing biologically realistic models for toxic chemical and drug effects, notably in physiologically based pharmacokinetic (PBPK) modeling, advancing the field of chemical risk assessment. Dr. Andersen’s prolific research output consists of over 500 papers and book chapters, earning him prestigious awards like the Lehman and Merit Awards from the US Society of Toxicology and the Mildred S. Christian Award from the Academy of Toxicological Sciences.

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Dr. Tee L. Guidotti

Tee L. Guidotti

Dr. Tee L. Guidotti is an esteemed international consultant in occupational and environmental medicine, specializing in risk management and sustainability. His work encompasses problem-solving, medical evaluation, medicolegal services, and extensive publishing and writing. Although retired from the George Washington University, he maintains active roles in teaching and research, holding adjunct faculty positions at West Virginia University and the University of Alberta. His interests span energy technologies, firefighter health, climate change adaptation, and science policy. Dr. Guidotti’s contributions include over 300 papers, eight books, and numerous awards, notably the Knudsen Award for Lifetime Achievement in Occupational and Environmental Medicine in 2013. His focus now centers on environmental sustainability and health.

Tee L. Guidotti's profile >>
Ila Cote

Ila Cote


Dr. Cote boasts over 35 years of expertise in public health risk assessment and environmental management. She advises governments and industries on chemical exposure risks and risk assessment implementation. An adjunct professor at the University of Colorado, she educates on environmental health, risk assessment, and public policy. Dr. Cote also teaches risk assessment at Rutgers University. Her research focuses on cancer, respiratory diseases, and enhancing risk assessment methods. She spent 27 years at the US Environmental Protection Agency, serving in roles like Senior Science Advisor, Division Director, and Associate Laboratory Director. Dr. Cote’s influence extends globally, advising organizations like the World Health Organization and the National Institutes of Health.

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Patricia Larkin

Patricia Larkin

Dr. Patricia Larkin’s career is dedicated to policy and regulatory assessments, focusing on the intersection of social determinants of health and health equity. Her expertise lies in managing human health and environmental risks, particularly in energy, water resources, and climate change. Patricia’s research explores Canadian innovation in energy regulatory decision-making and its impact on risk management. She has led interdisciplinary international research projects, addressing risk management in public decision-making and environmental issues like carbon capture and storage. As Chair of the Applied Risk Management Specialty Group of the Society for Risk Analysis, she continues to contribute to this field.

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RSI Expertise

John Lark


John Lark is a globally recognized expert in risk management, with a distinguished career spanning leadership roles in research, committee chairing, and board-level facilitation. He collaborates with international bodies, including the OECD, US EPA, and ISO. Mr. Lark’s expertise extends to speaking engagements at prominent conferences worldwide. He holds the CPRM certification and actively contributes to ISO committees. His extensive board experience includes chairing two not-for-profit boards and participating in major charities. He earned the ICD.D designation through the Director’s Education Program. Mr. Lark authored the international ISO Guide for implementing ISO 31000:2009.

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Peter Aggett

Peter Aggett

Dr. Peter Aggett, a Pediatrician specializing in Gastroenterology, Metabolism, and Chemical Pathology, focuses on essential trace elements in health and disease. He holds the position of Emeritus Head at Lancashire School of Health and Postgraduate Medicine and is a Professor of Child Health and Nutrition at the University of Central Lancashire. His extensive career includes roles in public health nutrition, nutrient risk assessment, and food safety, contributing to scientific advisory committees worldwide. Following retirement, Dr. Aggett continued as an External Expert for EFSA, reviewing Dietary Reference Values for essential micronutrients.

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RSI Expertise

Douglas McNair


Since 2002, Mr. McNair has led key aspects of Cerner’s Big Data operations, ensuring data quality for over 700 healthcare institutions. His role focuses on using this data for predictive models and decision-support solutions. McNair’s career at Cerner began in 1986, where he co-invented Discern Expert®, a real-time decision-support engine used globally. He held positions in regulatory affairs, served as a General Manager, and worked in pharmaceutical roles. McNair is a prominent figure in mathematical modeling, AI, and health finance, with over 100 patents and numerous publications. He’s also active in volunteer work and academic pursuits.

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Photo of Dr. Mustafs Al-Zoughool

Mustafa Al-Zoughool

Dr. Al-Zoughool, an associate professor at Kuwait University’s College of Public Health, conducts interdisciplinary research on public health risks, including chemical, biological, physical, and lifestyle factors’ impact on chronic diseases such as cancer and asthma. His work involves projects like modeling emerging infectious diseases, assessing occupational asthma in healthcare, and studying air pollution’s cardiovascular disease risk. He previously held positions at King Saud Bin Abdulaziz University for Health Sciences, the University of Ottawa, and the International Agency for Research on Cancer. With 38 peer-reviewed articles, three book chapters, and extensive involvement in classifying human carcinogens, Dr. Al-Zoughool is a distinguished researcher in the field.

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RSI Expertise

Nawal Farhat


Nawal Farhat is an epidemiologist with expertise in systematic reviews and database analysis. She collaborates with RSI on systematic reviews related to exposure-related health effects. Her doctoral research at the University of Ottawa focused on analyzing electronic medical records to study drug-drug interactions in cardiovascular patients. Nawal holds an MSc in Epidemiology, where she explored the health effects of air pollution in Canadian cities. Her background includes coordinating surveillance systems for communicable diseases at Lebanon’s Ministry of Public Health and teaching epidemiology and biostatistics courses.

Nawal Farhat's profile >>
Selim Muhammad Khan

Selim Muhammad Khan

Dr. Khan is a medical doctor with a master’s in public health and a Ph.D. in population health. He currently holds a CIHR-CMHC joint fellowship applying deep learning and geospatial intelligence to predict and map cancer risk from radon gas exposure, collaborating with the University of Calgary’s School of Architecture and School of Medicine. Dr. Khan also consults for the WHO on emergency health security and works as a research associate focusing on developing a next-generation risk assessment framework using new approach methodologies. His experience includes various roles in healthcare, academia, and international organizations, including the World Health Organization. Dr. Khan’s expertise covers global public health, digital surveillance, population health risk assessment, advanced data analytics, and more. He has received multiple awards and published numerous peer-reviewed research articles in high-ranking journals.

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RSI Expertise

Ian Arnold


Dr. Arnold, a former general surgeon and occupational health consultant in Labrador and Nouveau Quebec, served Quebec Cartier Mining Ltd and the Iron Ore Company of Canada from 1973 to 1981. He has held teaching positions at various Canadian medical faculties and currently serves as an Adjunct Professor at McGill University. Dr. Arnold earned his M.D. from Queen’s University in 1968 and has an extensive publication and presentation record with over 100 papers. He has received numerous honors for his contributions to occupational health and workplace psychological health and safety.

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RSI Expertise

Michael G. Bird


Dr. Bird is a distinguished professional with a Board Certification in Toxicology, Chartered Chemist status, and is recognized as a Fellow of the Royal Society of Chemistry. He earned both an MSc and a PhD in Toxicology and Biochemical Toxicology from Surrey University, UK. Dr. Bird’s contributions extend to over 40 publications, and his remarkable work in advancing regulatory science and policy in toxicology earned him the prestigious Achievement Award from the International Society of Regulatory Toxicology and Pharmacology in 2011.

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RSI Expertise

James Gomes


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RSI Expertise

Sam Kacew


Dr. Kacew is a distinguished figure in the field of toxicology, holding various prominent editorial positions. Notably, he serves as the Editor-in-Chief of the Journal of Toxicology and Environmental Health, Part A, and the Editor-in-Chief of the Journal of Toxicology and Environmental Health, Part B, Critical Reviews. Dr. Kacew is also the North American Editor for Toxicological and Environmental Chemistry and holds an Associate Editor role in Toxicology and Applied Pharmacology, among others. His extensive publication portfolio includes over 150 papers, reviews, and book chapters, with a focus on general toxicology, including renal, hepatic, and pulmonary toxicology. Additionally, he is a Member of the Board of Trustees for Toxicology Excellence for Risk Assessment (TERA).

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