Thank you to our 2026 Speakers

With more than 20 years of experience in environmental risk assessment and regulatory compliance, Jill Clark has dedicated her career to protecting public health and the environment through science-based decision making and collaborative problem solving. She began her career at the Georgia Environmental Protection Division as a Compliance Specialist, working with a variety of RCRA-regulated facilities to evaluate compliance with state and federal environmental regulations. 

For the past two decades, Jill has served as a Human Health and Ecological Risk Assessor, specializing in the evaluation and management of risks associated with contaminated properties, including hazardous waste sites, Brownfields, and Voluntary Remediation Program properties. Jill currently serves as the Risk Assessment Program Manager for the Georgia Environmental Protection Division.  

Throughout her career, Jill has contributed to numerous technical advisory groups and statewide initiatives. She served on the Technical Advisory Committee for the development of the Georgia Risk Assessment Guidance and participated in specialized workgroups focused on Vapor Intrusion, Area Averaging, and Soil-to-Groundwater evaluation methodologies. She also served as Co-Chair of the Georgia Department of Natural Resources Commissioner’s Advisory Board.

Her contributions to environmental protection and program leadership have been recognized through several honors, including the U.S. EPA National Notable Achievement Award for Cross-Program Results – Land Revitalization Team Award and selection to the 2022 Georgia Department of Natural Resources Leadership Academy.

Outside of work, Jill enjoys spending time outdoors with her family and their dog, Pip, exploring Georgia’s state parks through camping, hiking, and fishing. She also trains in the mixed martial art of Cuong Nhu.

Matthew Williams is a volatilization to indoor air specialist specializing on mitigation strategies and vapor intrusion, serving as the Volatilization to Indoor Air Specialist at the Michigan Department of Environment, Great Lakes, and Energy Remediation and Redevelopment Division (EGLE-RRD). In this role, he spearheads the development and implementation of methodologies to investigate and assess the vapor intrusion pathway, ensuring the safety and well-being of indoor environments.

As a program specialist and technical lead for the Vapor Intrusion Technical Assistance and Support Team, Matt has led numerous stakeholder groups and authored pivotal guidance documents, papers, and standard operating procedures. His expertise extends to conducting extensive trainings and delivering talks on sampling methods, vapor intrusion, petroleum vapor intrusion, mitigation, and indoor air quality both nationally and internationally.

Noteworthy among his contributions is Matt's leadership role in the Interstate Technology & Regulatory Council (ITRC), where he served as a section leader for the Petroleum Vapor Intrusion: Fundamentals of Screening, Investigation, and Management training in 2014. He also co-led both classroom and internet-based training teams and served as a co-leader for ITRC’s Vapor Intrusion Mitigation Team. Currently, Matt plays a crucial role as a co-leader for ITRC’s ongoing update for vapor intrusion, overseeing a collaborative effort involving nearly 200 professionals across the United States.

Matt holds a Bachelor of Science degree in Geology from Central Michigan University, earned in 1993, laying the foundation for his distinguished career in environmental science and indoor air quality management.