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Kent W. Thomas
RESEARCH PHYSICAL SCIENTIST
Exposure Measurements and Analysis Branch
Human Exposure and Atmospheric Sciences Division
EDUCATION/TRAINING
B.S.P.H. in Environmental Chemistry, 1979, School of Public Health,
University of North Carolina at Chapel Hill
PROFESSIONAL EXPERIENCE
Research Physical Scientist, USEPA, ORD, NERL, HEASD, EMAB, RTP, NC; 8/1998 to current.
Branch Chief (acting), USEPA, ORD, NERL, HEASD, EMAB, RTP, NC; 12/2007-12/2008.
Associate Director for Human Health (acting), USEPA, ORD, NERL, HEASD, RTP, NC; 9/2005-9/2006.
Research Analytical Chemist, Research Triangle Institute, RTP, NC; 1986-1998.
Analytical Chemist, Research Triangle Institute, RTP, NC; 1980-1986.
SELECTED AWARDS AND HONORS
USEPA NERL Special Achievement Award 2009
Scientific and Technological Achievement Award, Level 1, 2008
USEPA NERL Special Achievement Award 2007
USEPA Children’s Environmental Health Excellence Award 2007
USEPA NERL Special Achievement Award 2006
USEPA Silver Medal - Chemical Exposure Workgroup of the National Children’s Study 2005
SELECTED PUBLICATIONS (17 out of 35 from 1980 to present)
Thomas KW, Dosemeci M, Hoppin JA, Sheldon LS, Croghan CW, Gordon SM, Jones ML, Reynolds SJ, Raymer JH, Akland GG, Lynch CF, Knott CE, Sandler DP, Blair AE, and Alavanja MC. 2009. Urinary biomarker, dermal, and air measurement results for 2,4-D and chlorpyrifos farm applicators in the Agricultural Health Study. J Expos Sci Environ Epidemiol. epub ahead of print, doi:10.1038/jes.2009.6
Morgan M, Sheldon L, Thomas K, Egeghy P, Croghan P, Jones P, Chuang J, and Wilson N. 2008. Adult and children’s exposure to 2,4-D from multiple sources and pathways. J.Expos. Sci.. Environ. Epidemiol. 18(5):486-494.
Barr D, Thomas K, Curwin B, Landsittel D, Raymer J, Lu C, Donnelly K, and Acquavella J. 2006. Biomonitoring of exposure in farmworker studies. Environ. Health Perspect. 114(6):936-942.
Alavanja M, Sandler D, Lynch C, Knott C, Lubin J, Tarone R, Thomas K, Dosemeci M, Barker J, Hoppin J, and Blair A. 2005. Cancer Incidence in the Agricultural Health Study. Scand J. Work Environ. Health, suppl 1:39-45.
Gardner M, Spruill-McCombs M, Beach J, Michael L, Thomas K, and Helburn R. 2005. Quantification of 2,4-D on solid phase exposure sampling media by LC/MS/MS. J. Anal. Toxicol., 29:188-192.
Blair A, Sandler D, Thomas K, Hoppin J, Kamel F, Coble J, Lee W, Rusiecki J, Knott C, Lynch C, Lubin L, and Alavanja M. 2005. Disease and injury among participants in the Agricultural Health Study. J. Ag. Safety and Health 11(2):141-150.
Needham L, Whyatt R, Barr D, Wang R, Akland G, Naeher L, Bahadori T, Bradman A, Fortmann R, Liu R, Morandi M, O'Rourke M, Thomas K, Quackenboss J, Ryan P, Zartarian V, and Özkaynak H. 2005. Exposure assessment in the National Children's Study: Introduction. Environ. Health Perspect. 113(8):1076-1082.
Chuang J, Van Emon J, Durnford J, and Thomas K. 2005. Development and evaluation of an enzyme-linked immunosorbent assay (ELISA) method for the measurement of 2,4-Dichlorophenoxyacetic acid in human urine. Talanta 67:658-666.
Alavanja M, Dosemeci M, Samanic C, Lubin J, Barker J, Lynch C, Knott C, Hoppin J, Sandler D, Thomas K, Coble J, and Blair A. 2004. Pesticides and lung cancer risk in the Agricultural Health Study cohort. Am. J. Epidemiol.160(9):876-885.
Alavanja M, Samanic C, Dosemeci M, Lubin J, Tarone R, Lynch C, Knott C, Thomas K, Hoppin J, Barker J, Coble J, Sandler D, and Blair A. 2003. Use of agricultural pesticides and prostate cancer risk in the Agricultural Health Study cohort. Am. J. Epidemiol. 157(9):800-814.
Cohen-Hubal E, Sheldon S, Zufall M, Burke J, and Thomas K. 2000. The challenge of assessing children’s residential exposure to pesticides. J.Expos. Anal. Environ. Epidemiol. 10, 638-649.
Quackenboss J, Pellizzari E, Shubat P, Whitmore R, Adgate J, Thomas K, Freeman N, Stroebel C, Lioy P, Clayton A, and Sexton K. 2000. Design strategy for assessing multi-pathway exposure for children: the Minnesota Children’s Pesticide Exposure Study (MNCPES). J.Expos. Anal. Environ. Epidemiol. 10:145-158.
Thomas K, Pellizzari E, and Berry R. 1999. Population-based dietary intakes and tap water concentrations for selected elements in the EPA Region V National Human Exposure Assessment Survey (NHEXAS). J.Expos. Anal. Environ. Epidemiol. 9:402-413.
Thomas K, Sheldon L, Pellizzari E, Handy R, Roberds J, Berry M. 1997. Testing duplicate diet sample collection methods for measuring personal dietary exposures to chemical contaminants. J.Expos. Anal. Environ. Epidemiol. 7:17-36.
Pellizzari E, Lioy P, Quackenboss J, Whitmore R, Clayton C, Freeman N, Waldman J, Thomas K, Rodes C, and Wilcosky T. 1995. Population-based exposure measurements in EPA Region 5: A phase I field study in support of the National Human Exposure Assessment Survey. J.Expos. Anal. Environ. Epidemiol. 5:327-358.
Thomas K, Pellizzari E, Clayton C, Whitaker D, Shores R, Spengler J, Ozkaynak H, Froehlich S, and Wallace L. 1993. Particle Total Exposure Assessment Methodology (PTEAM) 1990 study: method performance and data quality for personal, indoor, and outdoor monitoring. J.Expos. Anal. Environ. Epidemiol. 3:203-226.
Thomas K, Pellizzari E, Clayton C, Perritt R, Dietz R, Goodrich R, Nelson W, and Wallace L. 1993. Temporal variability of benzene exposures for residents in several New Jersey homes with attached garages or tobacco smoke. J.Expos. Anal. Environ. Epidemiol. 3:49-73.
SELECTED PRESENTATIONS (9 out of 27 from 1998 to present)
Raymer J, Marriott B, Olso L, Fennell T, Busby-Whitehead J, Tulve N, and Thomas K. 2008. Factors important to defining susceptibility of the aging population to the effects of environmental exposures. International Society of Exposure Analysis/International Society of Environmental Epidemiology Joint Conference. Pasadena, CA.
Alavanja M, Sandler D, Hoppin J, Landgren O, Blair A, Hines C, Thomas K, Koutros S, Hou L, Baccarelli A, Andreotti G, Coble J, Beane-Freeman L. 2008. Cancer risk associated with pesticide exposure in the Agricultural Health Study: Introduction and recent findings. International Society of Exposure Analysis/International Society of Environmental Epidemiology Joint Conference. Pasadena, CA.
Alavanja M, Blair A, Coble J, Hoppin J, Sandler D, Lubin J, Dosemieci M, Hines C, Thomas K. 2007. The effect of pesticide exposure misclassification on cancer risk estimates in the Agricultural Health Study. 7th International Symposium on Biological Monitoring in Occupational and Environmental Health. Beijing, China.
Thomas K, Buehler S, Wilson N, Gordon S, Raymer J, Michael L, and Studabaker W. 2006. Environmental stressor and exposure information for older adults. International Society of Exposure Analysis/International Society of Environmental Epidemiology Joint Conference. Paris, France.
Okino M, Morgan M, Thompson C, Thomas K, Quackenboss J, Chapa G, Tornero-Velez R, Tsang A, Power F, and Dary C. 2006. Analysis of urinary biomarker data using pharmacokinetic models to assess exposure. Society for Risk Analysis Annual meeting. Baltimore, MD.
Thomas K, Chapa G, Jones P, Coble J, Dosemeci M, Croghan C, Hoppin J, Alavanja M. 2005. Predictors of exposure to 2,4-D for farm applicators in the Agricultural Health Study. International Society of Exposure Analysis Conference. Tucson, Arizona.
Sheldon S, Thomas K, Chapa G, Gordon S, Jones M, Raymer J, Sandler D, Hoppin J, Dosemeci M, Blair A, and Alavanja M. 2005. Results from the Agricultural Health Study - Pesticide Exposure Study. North American pesticide applicator and certification and safety education workshop. Madison, WI.
Thomas K. 2004. Evaluation of exposure measurement methods and approaches for the National Children's Study. National Childrens Study Pilot Study Meeting, Research Triangle Park, N.C.
Thomas K, Dosemeci M, Coble J, Chapa G, Croghan C, Jones P, Hoppin J, Sandler D, Blair A, and Alavanja M. 2004. Assessing exposure classification in the agricultural health study. International Society for Exposure Analysis 14th Annual Conference. Philadelphia, PA.
Thomas K, Sheldon L, Sandler D, Dosemeci M, and Alavanja M. 2002. Agricultural Health Study/Pesticide Exposure Study: study design and preliminary biomarker results. International Symposium on Agricultural Exposures and Cancer, Oxford, U.K.
Thomas K, Pellizzari E, Quackenboss J, Berry M, and Sexton K. 1998. Preliminary results for children’s dietary exposure to selected pesticides. International Society of Exposure Analysis/International Society of Environmental Epidemiology Joint Conference. Boston, MA.
NARRATIVE
Mr. Thomas has experience in the development and implementation of human exposure measurement methods for environmental contaminants. His experience includes complex multi-media and multi-pathway studies of total human exposure to VOCs, pesticides, PAHs, metals, and particles. Mr. Thomas has contributed to the development of sampling and analytical methodology for contaminants in air, water, food, dust, soil, blood, breath, and urine. Specific research experience includes the National Human Exposure Assessment Survey (NHEXAS), Minnesota Child Pesticide Exposure Study, Particle Total Exposure Assessment Methodology (PTEAM), and Total Exposure Assessment Methodology (TEAM) studies. He has led research on methods for collecting personal dietary samples and analysis of dietary samples for chemical contaminants. Mr. Thomas is the EPA team leader for the Agricultural Health Study (AHS) Pesticide Exposure Study and serves as the EPA representative to the inter-agency Executive Committee for the AHS. He is the task leader for exposure and activity research areas under ORD’s Aging Initiative research and works on Community Cumulative Risk and Biomonitoring research tasks.