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 value to RSI’s assessments of chemical tolerability, exposure limits, and public health protection standards.

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.

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 quantitative knowledge to building theoretical foundations and developing statistical software. Notably, he created the database-calibrated assessment process (DCAP) and the enhanced value-of-information (VOI) framework to aid in evidence-based regulatory decision-making, both of which have been reviewed by the Board of Scientific Counselors (BOSC). His applied statistical work provides assessments and tools to derive PODs for chemicals such as inorganic arsenic and fluoride to support both Canadian and international regulatory bodies.

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 into the design of data-driven, evidence-based decision-support applications for RSI’s clients. His team crafts custom IT solutions and leverages tools such as SQL Server, .NET,  Python, Excel, and R, to translate complex risk scenarios into interactive decision-support platforms.

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 single chemicals in isolation to understanding the cumulative effects of combined exposures. His current work includes the development of Mixture Adjustment Factors, participation in international regulatory committees, and authorship of scholarly publications aimed at refining the science-policy interface of chemical mixture risk.

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 and operations. His advisory scope spans both public and private sector clients, often at the interface of policy, compliance, and strategic foresight.

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 water, including formaldehyde, lead, and 1,4-dioxane. His research also extends to methodological innovation and the development of evidence-based strategies for environmental and occupational health policy.

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 Risk Action Framework and Toolkit) and the Global Risk Census, Alyanak has helped establish RSI as a global innovator in stakeholder- and constituency-centered risk engagement. His expertise in perception analysis and communications strategy enables RSI to address complex challenges across public health, regulatory affairs, environmental risk, and humanitarian crisis response. From pandemic-era messaging to multistakeholder workshops and regulator support, his work consistently focuses on aligning message, audience, and outcomes that can be measured. Recognized for his ability to navigate cross-cultural contexts and indigenous knowledge systems, Alyanak has worked extensively on in-region projects with local and indigenous communities worldwide. This grassroots experience informs his current portfolio, which includes collaboration and consensus-building projects that unite stakeholders and constituencies in addressing both shared and similar risks. He also provides regional, federal, and international policy guidance to companies and governing bodies seeking to design risk-informed policies, instruments, and frameworks. Drawing on extensive emergency preparedness and disaster response experience, Alyanak now leads RSI’s Disaster and Emergency-related projects, advancing practical, risk-based solutions to complex emergencies and strengthening resilience across sectors.

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 safety challenges across biological, chemical, and environmental domains.

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 applications.