RSI experts
Dedicated to risk
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 — the Leadership Team, Staff Experts, 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.
Of note, our experts' range of specialties is broad and growing, including: toxicology, epidemiology, biology, chemistry, engineering, mathematics, medicine, emergency management, risk management, risk assessment, application development and programming, new and traditional media expertise, human perception, and a variety of secondary skillsets — e.g. operational disaster response, ex- or retired government and regulatory staff — that collectively make RSI a unique consultancy able to understand, manage, and communicate risk effectively.
Greg Paoli
FSRA, MASc, BASc
CEO, Principal Risk Scientist
Greg Paoli is the CEO and Principal Risk Scientist at Risk Sciences International (RSI), a firm he co-founded in 2006 following the integration of his earlier consultancy, Decisionalysis Risk Consultants, with the consulting activities of the McLaughlin Centre for Population Health Risk Assessment at the University of Ottawa. Over nearly…
Dr. Daniel Krewski
FSRA, PhD, MHA
Chief Risk Scientist
Dr. Daniel Krewski is Chief Risk Scientist and co-founder of Risk Sciences International (RSI), a firm established in 2006 to bring evidence-based, multidisciplinary expertise to the challenge of understanding, managing, and communicating risk. As RSI’s inaugural CEO and long-time scientific leader, Dr. Krewski helped define the company’s ethos and methodological…
Dr. Donald Mattison
MD, MSc, BA
Chief Medical Officer, Senior Vice-President
Dr. Donald Mattison joined Risk Sciences International (RSI) in 2012 as Senior Vice-President and Chief Medical Officer, bringing with him a distinguished career spanning public health, clinical medicine, toxicology, and academic leadership. His appointment significantly strengthened RSI’s capacity to deliver integrated medical, epidemiological, and toxicological expertise across a wide range…
Cemil ‘Jim’ Alyanak
Vice-President Communications and Strategic Initiatives
Cemil ‘Jim’ Alyanak joined Risk Sciences International (RSI) in 2018 and serves as Vice-President, Communications and Strategic Initiatives. In this senior leadership role, he leads RSI’s risk communications practice, drives cross-cutting initiatives, advances strategic in-house projects, and expands the company’s international presence and partnerships. As creator of CRAFT (the Collective…
Dr. Emma Hartnett
PhD, BSc
Vice-President Risk Modelling and Simulation
Dr. Emma Hartnett is Vice-President, Risk Modelling and Simulation at Risk Sciences International (RSI), where she has been a foundational member since its inception in 2006. A globally recognized authority in quantitative risk assessment (QRA), she specializes in developing risk models and decision support tools for complex public health and…
Todd Ruthman
BASc
Vice-President Software and Modelling Solutions
Todd Ruthman serves as Vice‑President, Software and Modelling Solutions at Risk Sciences International (RSI) and has been with RSI since its founding in 2006. With a BASc in Systems Design Engineering from the University of Waterloo, Todd strives to understand the complex interactions in systems - a perspective that he channels…
Dr. Franco Momoli
PhD, MSc
Vice-President Chemical and Product Safety
Dr. Franco Momoli joined Risk Sciences International (RSI) in 2019 and currently serves as Vice-President, Chemical and Product Safety. In this role, he leads a multidisciplinary team of epidemiologists, risk assessors, toxicologists, and biostatisticians in conducting human health risk assessments related to environmental contaminants and consumer products. His practice group…
Dr. Anne Wiles
PhD, MA, BA
Senior Analyst
Dr. Anne Wiles joined Risk Sciences International (RSI) in 2008, where she currently serves as a Senior Analyst specializing in risk communication, perception, and governance. With a distinctive blend of expertise in language, regulation, and the use of science in decision-making, Anne has contributed to a wide range of RSI…
Dr. Michael G. Tyshenko
PhD, MPA
Senior Health Risk Analyst
Dr. Michael G. Tyshenko is a Senior Health Risk Analyst at Risk Sciences International (RSI), where he has contributed since 2018 to some of the organization’s most complex and cross-cutting public health risk projects. As RSI’s lead on chemical peer reviews, he brings extensive experience in regulatory science, biological risk,…
Dr. Natalia (Natasha) Shilnikova
MD, PhD
Senior Health Risk Analyst
Dr. Natalia (Natasha) Shilnikova is a Senior Health Risk Analyst at Risk Sciences International (RSI), where she has contributed since 2011 to some of the organization’s most analytically demanding and policy-relevant projects. With a background in medicine and a PhD in medical sciences, Dr. Shilnikova specializes in the synthesis of…
Dr. Nataliya Karyakina
MD, PhD, DABT, MSc
Senior Toxicologist, Health Risk Analyst
Dr. Nataliya Karyakina is a Senior Toxicologist and Health Risk Analyst at Risk Sciences International (RSI), where she has served since 2008. She plays a central role in RSI’s work at the intersection of chemical safety, regulatory science, and human health. Drawing on more than three decades of experience, Dr.…
Dr. Mustafa Al-Zoughool
PhD, MSc
Senior Toxicologist
Dr. Al-Zoughool has maintained a long-standing relationship with Risk Sciences International, both as a scientific collaborator and as a co-investigator on complex international projects. His work with RSI focuses on high-level public health risk modeling, mechanistic data analysis, and toxicological risk assessment of major environmental contaminants in air, soil, and…
Dr. Paul Price
PhD, MSc, BA, AA
Senior Analyst
Dr. Paul Price is a Senior Analyst at Risk Sciences International (RSI), bringing over four decades of experience as a pioneer in exposure science and chemical risk assessment. Since joining RSI in 2019, Dr. Price has focused on advancing mixture risk assessment—an increasingly vital area as regulators shift from assessing…
Andrew Maw
BSocSc
Senior Analyst
Andrew’s focus since retiring from the Canadian federal public service has been to help clients improve digital service delivery by maximizing the use of their data holdings and assisting government regulators in adopting risk-based compliance models derived from data on the individuals or businesses they oversee. This often involves developing…
Dr. Tee L. Guidotti
MD, MPH, BSc
Occupational and Environmental Health Expert, Toxicologist, Epidemiologist
As an Associate Expert with Risk Sciences International, Dr. Guidotti contributes deep expertise in occupational health, environmental risk, science policy, and sustainability. His work supports RSI’s evidence-based projects with clients across sectors, providing insight on complex risk challenges involving climate adaptation, environmental sustainability, and public health. His active consulting practice…
Dr. Shintaro Hagiwara
PhD, MSc, BMath
Risk Analyst, Statistician
Dr. Shintaro Hagiwara is a Risk Analyst and Statistician at Risk Sciences International (RSI), where he contributes cutting-edge statistical insight to risk assessments, particularly in chemical safety and public health. Since joining RSI’s technical team in 2018 and transitioning to a full-time role in 2023, he has applied his deep…
Dr. Paul Stanish
PhD, BSc
Risk Analyst
Dr. Paul Stanish joined Risk Sciences International (RSI) in 2021 as a Risk Analyst, where he plays an essential role in advancing data-driven risk practices. Leveraging his strong background in chemistry and nanotechnology, he supports clients in building modern data cultures grounded in causal inference, machine learning operations (MLOps), and…
Jennifer Go
MSc, BHSc, PhD Candidate
Risk Analyst, Epidemiologist
Jennifer joined RSI in August 2017 as a Risk Analyst with a specialization in epidemiology. To date, she has contributed to numerous literature reviews on various topics, including: Potential adverse health effects of asbestos in drinking water; Age-related cognitive decline in physicians; Potential adverse health effects of fluoride in drinking…
Hong Duan
BCS
Systems Analyst 2, Application Development
Hong Duan is a Systems Analyst and Application Developer at Risk Sciences International, where she has applied her expertise since 2011. She holds a Bachelor of Computer Science degree from the University of Ottawa and is certified as a Microsoft .NET Professional Developer. Hong specializes in developing database-driven, risk-based web…
Rosanna Wong
BSc
Junior Risk Analyst
Rosanna Wong is a Junior Risk Analyst at Risk Sciences International (RSI), where she supports multidisciplinary projects at the intersection of climate resilience, food systems, and public safety. Since joining RSI in 2021, Rosanna has contributed to a broad range of research areas, including foodborne disease, intentional food adulteration, transportation…
Margaret Wilson
MSc, BSc, BEd
Senior Risk Analyst
Margaret Wilson is a Senior Risk Analyst at Risk Sciences International (RSI), where she has been a foundational member since the company’s inception in 2006. Drawing on a rare combination of scientific breadth and analytical precision, Margaret has supported and led a wide range of multidisciplinary projects spanning microbial and…
Martin LeBlanc
Business Development
Since joining Risk Sciences International in 2019, Martin has served in Business Development, leading RSI’s business expansion efforts across Canadian and global markets. He is instrumental in identifying and qualifying opportunities, coordinating multidisciplinary proposal teams, developing project frameworks, and supporting contract negotiations. His expertise spans the entire procurement spectrum, including competitive tenders, standing offers,…
Monique MacDonald
Dip. BA & Acct.
Office Administrator
Monique MacDonald is a seasoned Office Administrator with over thirty-five years of experience ensuring the smooth and efficient operation of office environments. She joined Risk Sciences International (RSI) in 2017, where she oversees the full range of internal operations and provides essential support across RSI’s scientific, operational, and client engagement…
Sean Hart
Budgeting and bookkeeping
Sean Hart is RSI’s Finance Officer and Bookkeeper, where he manages the company’s core financial operations and supports project-level accounting. With a strong command of both accounting principles and digital systems, Sean ensures the integrity, accuracy, and compliance of RSI’s financial records and reporting. Sean’s responsibilities include payroll administration, cash…
Dr. C. Calvin Willhite
PhD
Dr. Willhite is an Associate Expert at Risk Sciences International, where he supports the development of quantitative health risk assessments for both naturally occurring and synthetic chemicals. His work draws on decades of experience integrating toxicological evidence, regulatory frameworks, and structure–activity data to inform science-based decision-making. His expertise adds significant…
Dr. Patricia Larkin
PhD
Dr. Larkin serves as an Associate Expert at Risk Sciences International, specializing in policy, regulatory analysis, and population health risk assessment. Her work with RSI has included life cycle assessments of metals, as well as a review of Alberta’s Water Cytotoxicity Testing Program. She contributes rigorous, equity-sensitive approaches to risk…
Dr. Ila Cote
PhD, BA
Dr. Cote is an Associate Expert at Risk Sciences International, where she brings world-class expertise in environmental health risk assessment, risk management, and science-informed public policy. She contributes to projects that require strategic application of risk methodologies to environmental, occupational, and chemical exposure issues—often at the intersection of regulation, sustainability,…
Dr. Douglas McNair
MD, PhD
As a Software Engineering Fellow at RSI, Dr. McNair brings unparalleled expertise in machine learning, Bayesian modeling, and decision-support systems. He supports RSI’s most advanced projects by designing and validating AI/ML architectures that meet both regulatory standards and ethical imperatives, including fairness, transparency, and distributive justice. His domain expertise spans…
John Lark
MSc, BSc, ICD.D, CCSA, CRMA, CPRM
As a Risk Management Expert at RSI, John Lark brings a wealth of practical and policy-level experience to support strategic risk frameworks, enterprise-level risk reviews, and board advisory services. He contributes to RSI projects that require deep knowledge of international standards (especially ISO 31000) and risk integration into organizational governance…
Dr. Syed A. Sattar
PhD, Dip. Bact.
As a Microbiologist with Risk Sciences International, Dr. Sattar contributes his deep expertise in pathogen ecology, environmental microbiology, and infection control technologies to support RSI’s work in health risk assessment and risk mitigation. His insights guide RSI’s contributions to evidence-based disinfection strategies, microbial exposure modelling, and policy-relevant evaluations of infectious…
Dr. William Leiss
OC, FRSC, PhD
As a Senior Advisor and Associate Expert with Risk Sciences International, Dr. Leiss contributes unparalleled insight into the design, delivery, and evaluation of risk communication strategies for government, regulatory bodies, and civil society. His legacy work in building public trust around controversial science and his decades of thought leadership on…
Dr. Ian Arnold
FCBOM, CSPQ, MD, MSc
As an Associate Expert with Risk Sciences International, Dr. Arnold brings clinical depth and field experience to RSI’s work in occupational health risk assessment and workplace safety policy development. He provides expert insight on topics such as exposure-related health outcomes, physical and psychological stressors in industrial settings, and the integration…