Thank you to our 2023 Speakers

Dr. Claudio Sorrentino is the Senior Toxicologist and Chief of the Northern California Unit of the Human and Ecological Risk Office at the California Department of Toxic Substances Control. He serves as scientific and technical advisor to programs within DTSC and other agencies on risk assessment, exposure assessment, and on toxicological and risk communication issues.  He graduated from the School of Pharmacy of the University of Rome “La Sapienza”, Italy where he also received a graduate degree in Pharmacology (Toxicology Track) from the School of Medicine.  He earned his Ph.D. from New York University in Environmental Health Sciences (Toxicology track) and was a postdoctoral scholar in Environmental Toxicology at the University of California Davis with Mike Denison. Dr. Sorrentino has been active of the Interstate Technology and Regulatory Council (ITRC) as team member, trainer, leader of three of their teams, and now as member of the Board of Advisers. He is a member of the Standing Committee on the Use of Emerging Science for Environmental Health Decisions of the National Academy of Sciences, an Adjunct Assistant Professor of Environmental Toxicology at the University of California Davis, and serves on the Scientific Advisory board of the AEHS West Coast Conference.

In his spare time, Claudio enjoys landscape and wildlife photography, fishing (or better “attempting” to fish), and kayaking.

Dr. Justin Meredith is an Environmental Fellow at the Tennessee Department of Environment and Conservation Division of Remediation (TDEC-DoR). This role includes preforming a diverse range of responsibilities, including writing Rules, creating guidance documents, and providing technical support to multiple divisions within TDEC. Justin has extensive experience and knowledge in addressing vapor intrusion related issues through remediation, mitigation, and risk assessment. Prior to his tenure at TDEC, Justin worked for Environmental Chemical Corporation, where he gained valuable experience working on remediation projects. In addition to his work at TDEC-DoR, Justin serves as the Tennessee point of contact for the Interstate Technology and Regulatory Council, represents Tennessee on the EPA Federal-State Toxicology Risk Analysis Committee, and sits on the Chemicals of Emerging Concern steering committee of the Association of State and Territorial Solid Waste Management Officials. 

Ahmet Bulbulkaya is currently one of the Environmental Fellows for TDEC’s Division of Remediation. He has been involved in assessing the vapor intrusion pathway at hazardous substance sites since the late 1990’s when he was hired by the Virginia Department of Environmental Quality shortly after the inception of their Voluntary Remediation Program. In 2010 he moved to Tennessee with his family and began working with TDEC’s Division of Remediation. He is still heavily involved in vapor intrusion issues and is one of the main authors developing a vapor intrusion guidance specific to Brownfield projects being managed under the State’s Voluntary Oversite and Assistance Program (VOAP). Ahmet has a master’s degree in Environmental Toxicology from the Duke University Nicholas School of the Environment. 

David Kelly G. Johnson, P.G., is the NC Brownfields Redevelopment Section Vapor Intrusion (VI) Specialist at the NC Department of Environmental Quality (NCDEQ) in Raleigh, North Carolina. He provides staff training and support on VI issues and assessments, assists in development of VI guidelines, and reviews VI mitigation designs. Prior to joining NCDEQ, Kelly worked in consulting conducting soil, groundwater, and VI investigations. Kelly is also co-team leader for the Interstate Technology and Regulatory Council (ITRC) VI Mitigation Training Team.