Scientists Currently Associated with EHRF

John E. Heinze, Ph.D.
Executive Director
Environmental Health Research Foundation
Chantilly, Virginia

As the Executive Director, Dr. John Heinze brings over 30 years of research, management, and communications experience to the EHRF. In addition to his expertise in microbiology, molecular biology, genetics, and toxicology, Dr. Heinze has authored over 35 scientific papers and presentations to international conferences and workshops.

Dr. Heinze received his doctorate in microbiology from the University of Illinois at Champaign-Urbana, and conducted two years of postdoctoral study in molecular biology and genetics at the National Institutes of Health in Bethesda, Maryland

Since 1995, Dr. Heinze has served as a senior science adviser on health and environmental issues, including the communications aspects of such issues. A particular focus has been on communication of health and environmental safety information including activities ranging from those focused on single substances to broad issues affecting numerous materials.

Ronald D. Hood, Ph.D.
Professor Emeritus
Department of Biological Sciences
The University of Alabama
Tuscaloosa, Alabama
Principal, Ronald D. Hood and Associates,
Toxicology Consultants
Tuscaloosa, Alabama

For over 40 years, Dr. Ron Hood has conducted research and shared his knowledge of biology with students at The University of Alabama. Dr. Hood’s research has focused on developmental and reproductive toxicology and the effects of environmental exposures. Dr. Hood has over 100 publications encompassing original papers, reviews, book chapters, and books, and is the editor of Developmental and Reproductive Toxicology—a Practical Approach (2006). Throughout his career, he has been actively involved in professional societies, including the Teratology Society and the Society of Toxicology, and has served on the editorial boards of science journals, including Toxicological Sciences.

Dr. Hood is a recognized expert in the field of developmental toxicology. He has served as an invited expert in science workshops and review panels sponsored by the Agency for Toxic Substances and Disease Registry, the Centers for Disease Control and Prevention, the Congressional Office of Technology Assessment, the U.S. EPA, the National Center for Toxicological Research, the National Institute for Environmental Health Sciences (NIEHS), the Joint Research Center, European Commission, and ILSI/HESI. From 1983-1993 he served as a special consultant to the Environmental Health Committee of the Science Advisory Board to the U.S. EPA.

David J. Kent
Consulting Scientist
Washington DC.

David J. Kent has over 20 years of professional experience in the areas of environmental toxicology, ecological risk assessment and product registration. He has addressed scientific, regulatory, and policy issues on chemicals, pesticides, wastewater discharges, and hazardous wastes for a wide range of domestic and international clients. David most recently has focused on compiling and evaluating data for the various worldwide High Production Volume chemical programs and assessing potential risk issues from newly emerged chemicals of concern.

David has authored or co-authored over 35 scientific publications and presentations for peer-reviewed journals and international conferences. He is actively involved in regional, national, and international scientific organizations.

John N. Rapko, Ph.D. 
Research Associate
Environmental Health Research Foundation

Dr. John N. Rapko’s career includes over 30 years of involvement as a Manger of Technology at Monsanto and Huntsman Corporation in industrial process chemistry and industrial chemical processes spanning a number of products including surfactant intermediates and detergent ingredients at commercial scale facilities. His industrial experience also includes work on waste treatment projects including deepwell waste injection facilities, incinerators and biological waste water treatment facilities.

Dr. Rapko received his Ph.D. from Saint Louis University in inorganic chemistry. In addition to his broad industrial career, he has also taught general and organic chemistry at the Saint Louis College of Pharmacy. He is the inventor or co-inventor of 11 United States patents and has published a number of papers in academic journals.

Other environmentally related activities include a long standing relationship with CLER (Council for LAB/LAS Environmental Research) where he has participated in the preparation of an OECD SIDS Dossier on linear alkylbenzene and linear alkylbenzene sulfonate (LAS) which includes extensive environmental health and safety data as well as environmental risk assessment information on these materials. He also has participated in the preparation of environmental and wastewater assessment Fact Sheets for CLER related to LAS, the world’s most highly used laundry surfactant.

Katherine von Stackelberg, Sc.D.
Principal, NEK Associates
Allston, Massachusetts
Risk Manager, Harvard Center for Risk Analysis
Harvard University
Boston, Massachusetts

Dr. Katherine von Stackelberg specializes in developing risk-based modeling tools to support environmental decision-making. Much of her work has focused on incorporating quantitative uncertainty analysis (e.g., analytical, probabilistic, and fuzzy methods) into the risk assessment process, and she has been at the forefront of the effort to promote uncertainty analysis and methods for communicating uncertainty to support environmental decision-making. She has extensive experience in the context of management of contaminated sediments. An emerging focus area for Dr. von Stackelberg is developing tools and methods to support sustainable approaches to environmental decision-making, particularly with respect to ecosystem services.

Dr. von Stackelberg serves on the US EPA Board of Scientific Counselors and is leading an effort to explore the use of decision analytic tools and methods to support environmental decision making within the Office of Research and Development, and is a member of the Scientific Advisors on Risk Assessment for the European Commission in Brussels. She is also a Research Manager at the Harvard Center for Risk Analysis overseeing a grant on uncertainty analysis in decision-making.

Dr. von Stackelberg received an A.B. cum laude from Harvard College, and a Sc.M. and Sc.D. from the Harvard School of Public Health in Environmental Science and Risk Management.

Raphael Jay (Ray) Witorsch, Ph.D.
Professor of Physiology
School of Medicine
Virginia Commonwealth University
Richmond, Virginia

Dr. Ray Witorsch’s field of expertise is endocrinology and the health effects of exposures to environmental substances. He has taught endocrinology to medical students, graduate students, and other health professionals for 30 years. Throughout his academic career, a major area of interest has been in the area of hormone research including the recent topic of endocrine disruption.

Dr. Witorsch is the author of 60 scientific papers, reviews and book chapters.

In addition to his academic career, Dr. Witorsch has provided consultation to various clients on the health effects of a broad range of environmental substances including analysis of published laboratory research and epidemiological papers, preparation of position papers for such agencies as the California EPA, the U.S. EPA, the Food and Drug Administration and the Occupational Safety and Health Administration, and presentation of expert testimony at trials, depositions, and public hearings.