Our Professionals

Meet our team of highly skilled and experienced epidemiologists.

Dr. Herman Gibb, Ph. D., M.P.H.

Dr. Gibb is an epidemiologist with an extensive background in health risk assessment. Prior to forming Gibb Epidemiology Consulting, he was President of Tetra Tech Sciences, an operating unit of the Tetra Tech Corporation focused on health risk assessment. At Tetra Tech Sciences, Dr. Gibb provided consulting to a variety of government, private, and international clients. Before joining Tetra Tech in 2004, Dr. Gibb had a career at the U.S. Environmental Protection Agency where he participated in the epidemiologic assessment of a variety of substances and was the primary author of an influential study on the risk of lung cancer among chromium production workers. He was a member of the Carcinogen Assessment Group - the beginning of U.S. EPA’s approach to carcinogen risk assessment and is the recipient of numerous EPA awards including the Gold Medal for his work on the risk assessment of arsenic. He was an invited participant on all of the World Health Organization’s (WHO) Final Review Boards on Concise International Chemical Assessment Documents and a member of WHO’s Risk Assessment Steering Group. He is an author of WHO's Principles for the Assessment of Risks to Human Health from Exposure to Chemicals.

Dr. Gibb has a Ph.D. in epidemiology from Johns Hopkins and an M.P.H. in environmental health from the University of Pittsburgh. He is an adjunct faculty member at the George Washington University (GWU) and serves as a preceptor for GWU public health graduate students. In 2011, Dr. Gibb was awarded the Practitioner of the Year award by the Society for Risk Analysis. He currently chairs a WHO task force on chemicals in food. He is a member of the Scientific Advisory Committee of the United States Transuranium and Uranium Registry and a member of the Presidential Advisory Board on Science, Engineering, and Health at the Ana G. Mendez University System in San Juan, Puerto Rico. Dr. Gibb is a Lieutenant Colonel (ret) U.S. Army Reserves.

Contact Dr. Gibb


(703) 888-6059

Keri Grace O'Leary (née Fulcher), M.S.

Mrs. Keri O'Leary is an Epidemiologist at Gibb Epidemiology Consulting. She has experience in literature evaluation, exposure and health risk assessment, and statistical analysis. Mrs. O'Leary specializes in evaluating individuals' exposure and work history and subsequent risk for disease. She has worked on all facets of epidemiological research including study development, data analysis, and interpretation.

Mrs. O'Leary received her B.S. in Biology from The College of William and Mary in 2008. In 2012, she earned her M.S. in Epidemiology from The George Washington University. Mrs. O'Leary is currently pursuing her Ph.D. in Epidemiology at The George Washington University Milken Institute School of Public Health. She is also a Graduate Assistant in the Department of Epidemiology and Biostatistics. From 2008 through 2010, she prepared proposals for a biopharmaceutical company focused on the utilization of PRDM genes in cancer therapy (2008), reviewed clinical trials for a contractor at the National Library of Medicine (2008-2009) and managed pharmaceutical master files and researched food contact requirements at a food and drug law firm in Washington, D.C (2009-2011). From 2011 to 2014, Mrs. O'Leary worked for Tetra Tech Sciences as an Epidemiologist. At Tetra Tech Sciences, she worked on various projects including peer reviews and consultations for government clients and the World Health Organization.

Contact Mrs. O'Leary

Our work

Gibb Epidemiology Consulting puts its professionals' expertise to use conducting expert reviews; designing, conducting, analyzing, and reporting on studies; and conducting education and training programs.

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