Northeast Representative

Mark Distler

Vice President
Phone: 315-437-6100 Ext. 2536
Email: DistleMA@obg.com

BS/Chemical Engineering - University of Rochester

Areas of Expertise:

Mr. Distler has 27 years of environmental experience, and is currently responsible for management and technical direction of many O’Brien & Gere’s vapor intrusion (VI) projects. He directs a wide range of tasks associated with VI sampling, evaluation, strategy, and mitigation, and has developed and managed quality control activities at some of the nation’s largest and most complex VI sites. As a member of a multi-state task force on VI, Mr. Distler consults regularly with state regulators and other stakeholders in the development of regulatory policy and scientific methods used to assess and evaluate VI sites. Mr. Distler leads a team of O'Brien & Gere VI practitioners in the development of new and refined technical skills and market awareness.

Midwest/West Representative

Matthew Traister, PE

Senior Managing Engineer
Phone: 513-697-2021
Email: TraistM@obg.com

BS/Chemical Engineering - Clarkson University

Areas of Expertise:

Matthew Traister, P.E. is a Senior Managing Engineer for O’Brien & Gere, and has more than 20 years of environmental consulting experience. Mr. Traister consults regularly with state regulators and other stakeholders in the development of regulatory policy and scientific methods used to assess and evaluate vapor intrusion (VI) sites. Mr Traister has chaired four national seminars on vapor intrusion, and is the author of dozens of technical articles.

Areas of Expertise:

Dr. Schew has more than 20 years environmental experience with an emphasis on human health risk assessment and exposure evaluations.  His project experiences range from sophisticated vapor intrusion fate and transport modeling to evaluating human exposure to airborn particulates to quantitatively assessing alternatives for remedial designs and mitigation systems that address human health risks from the vapor intrusion pathway.  Recently, Dr. Schew participated with industry and government leaders as part of the Interstate Technology and Regulatory Council (ITRC) Vapor Intrusion Team and consults regularly with state regulators and other stakeholders in the development of regulatory policy and scientific methods used to assess and evaluate VI sites.  Dr. Schew has been active in litigation support for 10 years.  He has provided technical support to legal teams in the from of document review, site inspection, providing written opinion and affidavit, as well as expert testimony at depositions and hearings.  His has been acknowledged in court proceedings as an expert in assessing vapor intrusion, human health risk assessment, ecological risk assessment, and quantitative environmental modeling.