ToxServices Staff (Selected)

Margaret H. Whittaker, Ph.D., M.P.H., CBiol., F.R.S.B., E.R.T., D.A.B.T. (Managing Director and Chief Toxicologist)

Dr. Margaret H. Whittaker has over twenty years of experience in both the performance and management of toxicology and human health hazard and risk assessment-related projects. She is currently the Managing Director and Chief Toxicologist of ToxServices LLC, where she serves as the project manager and technical lead of ToxServices projects for the United States Environmental Protection Agency's Safer Choice Program, Clean Production Action's GreenScreen®, international certification organizations, testing laboratories, and consumer products companies that manufacture and test products such as food additives, food contact materials, cleaning chemicals, fragrance agents, electronics, cosmetics, dietary supplements, medical devices, pharmaceuticals, and drinking water additives. As project manager and technical lead for contracts with these organizations, Dr. Whittaker has contributed to and/or managed the development of hundreds of human health risk assessments, chemical hazard assessments, exposure assessments, as well as hundreds of product-specific toxicology evaluations.

Dr. Whittaker is a Diplomate of the American Board of Toxicology who earned a Ph.D. in Toxicology from The University of Maryland, Baltimore and an M.P.H. in Environmental Health from The University of Michigan. Dr. Whittaker is a U.K./Eurotox Registered Toxicologist, as well as a Chartered Biologist and Fellow of the U.K. Royal Society of Biology. Dr. Whittaker has built her career on a foundation grounded in leadership and adherence to details and timelines. One of her first career awards (1992) was a United States Coast Guard Commandant's Award for Outstanding Civilian Service, where her "alacrity and tenacity" displayed while working on projects associated with the Oil Pollution Act of 1990 were officially recognized.

In addition to her extensive program management experience, Dr. Whittaker has extensive technical experience in hazard identification and non-cancer and cancer dose-response assessment, including quantitative risk assessment (e.g., benchmark dose modeling for both carcinogens and non-carcinogens). She specializes in conducting chemical hazard assessments and chemical alternatives assessments. Prior to creating ToxServices in 2003, she worked at two of the country's leading toxicology and risk assessment consulting firms (The ENVIRON Corporation and The Weinberg Group).

Megan Boylan, M.S. (Toxicologist)

Ms. Megan B. Boylan is an Toxicologist who earned her M.S. in Biotechnology from Johns Hopkins University in Baltimore, Maryland. Previous to working for ToxServices LLC, Ms. Boylan worked for The Geneva Foundation as a Laboratory Technician at the United States Army Medical Research Institute of Chemical Defense. Since joining ToxServices, Ms. Boylan has developed human health risk assessments for chemicals being added directly and indirectly to drinking water. Ms. Boylan reviews and evaluates the formulations of drinking water system components, drinking water treatment units, drinking water treatment chemicals, personal care products, medical devices, and food equipment, and then determines compliance of these products with appropriate health-based standards. Ms. Boylan is an experienced auditor, and provides GMP and GLP auditing services to pharmaceutical, food additive, dietary supplement, and consumer product formulators. Ms. Boylan works on product evaluations for the U.S. EPA's Safer Choice Program. Ms. Boylan has extensive laboratory experience in both in vivo and in vitro investigational techniques in the areas of inhalation toxicology and genotoxicity.

Jennifer G. Fleischer, M.H.S., Ph.D. (Senior Toxicologist)

Dr. Jennifer G. Fleischer is a Senior Toxicologist and Risk Assessor who earned her Ph.D. in Toxicology and M.H.S. in Environmental Health Sciences from Johns Hopkins University. Dr. Fleischer prepares quantitative human health risk assessments, product and ingredient safety assessments, and regulatory compliance evaluations for a diverse range of substances within a variety of national and international regulatory contexts, including food allergens, food additives, food contact materials, medical devices, consumer/household products, personal care products/cosmetics, pharmaceuticals, and dietary supplements, among others. Recent work has focused on quantitative exposure assessments, particularly for Proposition 65-listed substances, nanomaterials, and impurities, often in response to actual or potential litigation. Dr. Fleischer advises clients on key technical issues, such as clinical and nonclinical testing strategies, study design, and monitoring; the scientific merit of test data provided by claimants; regulatory compliance requirements for U.S., EU, and other markets; and interpretation of test data and literature. She provides critical scientific support to inform her clients' risk management decisions (e.g., product recalls, product liability claims) in a transparent and scientifically-sound manner. Dr. Fleischer additionally prepares Safety Data Sheets (SDS), alternatives assessments, and comparative hazard assessments; compiles and reviews toxicological evaluations of chemicals considered for regulation under EPA's Safe Drinking Water Act; and performs hazard assessments and modeling of chemicals under EPA's ECOSAR, EPI Suite, and Benchmark Dose Software and OECD Toolbox software. Prior to joining ToxServices, Dr. Fleischer served as a consulting toxicologist for a private firm and as a project manager and toxicologist in in vivo and in vitro contract toxicology/pharmacology laboratories.

Zach Guerrette, Ph.D., D.A.B.T. (Toxicologist)

Dr. Zach Guerrette is a Toxicologist with a Ph.D. in Environmental Toxicology from the University of Washington and B.S.'s in Biochemistry and Zoology/Ecology, also from the University of Washington. Dr. Guerrette is a Diplomate of the American Board of Toxicology. Prior to earning his graduate degree, Dr. Guerrette worked at RIDOLFI, Inc., first as an intern and then as an environmental scientist, where he reviewed and evaluated documents pertaining to the release and toxicity of contaminants present on a Superfund hazardous waste site and contributed to the writing of a pre-assessment screen as part of a natural resource damage assessment (NRDA). While attending graduate school, Dr. Guerrette assessed the relationship between levels of pesticide exposure and biological impacts on apple orchard farm-workers and identified genetic markers of susceptibility for these effects. During his time at ToxServices, his consultation experience involves assessing the state of knowledge for the toxicity of pharmaceutical, cosmetic, and cleaning products under the U.S. EPA's Safer Choice Product Labeling Program, Cradle to Cradle Certified™ Products Program, Program and Clean Production Action's GreenScreen® for Safer Chemicals, deriving no significant risk levels and performing quantitative exposure assessments for product compliance under the State of California's Proposition 65, and making recommendations as to the recommended occupational or environmental exposure levels for chemicals.

Bingxuan Wang, Ph.D., D.A.B.T. (Senior Toxicologist)

Dr. Bingxuan Wang is a Senior Toxicologist who obtained her Ph.D. in Human Toxicology from the University of Iowa in Iowa City, Iowa. Dr. Wang is a Diplomate of the American Board of Toxicology. She has extensive laboratory experience investigating the toxicity of polychlorinated biphenyls (PCBs), a class of persistent organic pollutants in the environment, as well as studying the mechanisms of water eutrophication. Since joining ToxServices, Dr. Wang has performed cancer and non-cancer risk assessments for chemicals to evaluate the human health and ecotoxicological safety of consumer products, industrial chemicals, dietary supplements and food additives for private sector clients. In addition, Dr. Wang evaluates products for submission to the U.S. EPA's Safer Choice Labeling Program and performs chemical hazard screens using Clean Production Action's GreenScreen® for Safer Chemicals and has been a GreenScreen® for Safer Chemicals training course instructor.

Jennifer Rutkiewicz, Ph.D. (Senior Toxicologist)

Dr. Jennifer Rutkiewicz earned her Ph.D. in Environmental Health Sciences from the University of Michigan, where she studied the neurological impacts of mercury in birds, and her M.S. in Biological Sciences from Wright State University, where she studied the immunological impacts of organochlorine contaminants in birds. Prior to working at ToxServices, Dr. Rutkiewicz completed a postdoctoral fellowship at the University of Michigan and was involved in assessments of mercury exposure and impacts in wild caught Arctic marine mammals, evaluation of effects of flame retardants in captive birds, and development of high throughput neurochemical assays for toxicological screening studies. Since joining ToxServices, she has performed toxicological assessments of cosmetic and personal care products and human health risk assessments of chemicals extracting from medical devices and drinking water system components. Dr. Rutkiewicz evaluates product submissions to U.S EPA's Safer Choice Product Labeling Program, GreenBlue®'s CleanGredients®, Clean Production Action's GreenScreen® for Safer Chemicals, and the Cradle to Cradle Certified™ Products Program.

Mouna Zachary, Ph.D. (Toxicologist)

Dr. Mouna Zachary is a chemist who earned her Ph.D. in chemistry from the University of York/ UK. Prior to working at ToxServices, she completed a postdoctoral fellowship at the University of Hull, where she was involved in conducting PBT, endocrine disruptor, and mutagenicity screenings for chemicals of interest using Quantitative Structure Activity Relationship (QSAR) software. Dr. Zachary has expertise in both European and North American regulations pertaining to chemicals, and has conducted numerous workshops pertaining to REACH compliance and appropriate use of QSAR software. She also has experience in classification and labelling of chemicals according to CLP/GHS and REACH. Since joining ToxServices, she has prepared several Provisional Peer-Reviewed Toxicity Value documents for the U.S. EPA's National Center for Environmental Assessment, prepared safety data sheets in accordance with CLP/GHS and OSHA, and screened chemicals using Clean Production Action's GreenScreen® for Safer Chemicals.

Sara Ciotti, Ph.D. (Toxicologist)

Dr. Sara Ciotti is a Toxicologist who earned her Ph.D. in Pharmacology and Toxicology from Michigan State University in East Lansing, Michigan. During her Ph.D. she studied the effects of chronic exposure to low levels of methylmercury on neuronal calcium regulation and mitochondrial function in mice. Since joining ToxServices, she has performed toxicological assessments of cosmetic and personal care products for private sector clients.

Edward Pavia, M.S. (Senior Program Manager)

Mr. Edward Pavia is a Senior Program Manager who earned his Bachelors of Arts degree in Physics from the University of North Carolina, Wilmington and his Masters of Science degree in Appropriate Technology from Appalachian State University. Mr. Pavia served as Legislative Assistant and Science Advisor to Congressman Heath Shuler in 2012 where he worked to draft legislation focused on the issues of Technology, Energy and the Environment. Mr. Pavia manages multiple programs at ToxServices, including the Cradle to Cradle Certified™ Products Program and Health Product Declarations™, Living Product Challenge™ assessments, and ToxServices Full Materials Disclosure (ToxFMD®) Program.

Erica Harriman, B.S. (Safer Choice Program Manager)

Ms. Erica Harriman serves as ToxServices Safer Choice Program Manager. In that role, she manages ToxServices' U.S. EPA's Safer Choice Product Labeling Program and GreenBlue®'s CleanGredients® Program Operations. Erica directs and manages client, U.S. EPA, and GreenBlue® interactions, project budgets, and project timelines. She works closely with ToxServices' toxicologists to complete projects quickly and within budget. She also oversees staff dedicated to supplier disclosure and communication. Since joining ToxServices in 2013, Ms. Harriman has been instrumental in implementing systems dedicated to increasing efficiency of third-party reviews. Ms. Harriman earned her Bachelors of Science degree in Integrated Science and Technology with an Environmental concentration from James Madison University in Harrisonburg, Virginia.

Bergen Hubert, M.S. (Sustainability Scientist)

Ms. Bergen Hubert is a Sustainability Scientist at ToxServices LLC. Ms. Hubert holds a B.A. in Environmental Sciences and Global Sustainability from the University of Virginia, and a M.S. in Environmental Science: Legislation & Management from the Institute for the Environment at Brunel University London. Ms. Hubert has been working in the environmental sector for the past five years. She has experience in sustainability, environmental consulting, carbon accounting, water management, and environmental legislation projects. She works with Safer Choice, CleanGredients, and Full Materials Disclosure (ToxFMD®) clients, manages FMD projects from start to finish, and ensures that critical timelines and budgets are carefully followed.

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Select Staff Biography

Margaret H. Whittaker
Megan Boylan
Sara Ciotti
Jennifer G. Fleischer
Zach Guerrette
Erica Harriman
Edward Pavia
Jennifer Rutkiewicz
Bingxuan Wang
Mouna Zachary