Election of Officers takes place in the fall of each year. Terms of office are two (2) calendar years unless noted otherwise. Positions include: President (3-year term, beginning as President- Elect, then President, then Past-President), Secretary/Newsletter Editor, Treasurer/Membership Officer (3-year term), Website Officer (3-year term), Member-at-Large, Business, University and Government Representatives, and two (2) Student/Postdoc Representatives (elected in alternate years).

If you would like more information or wish to volunteer to be put on the ballot for election, please contact the current President of GETA.

2023 GETA Board Members


Jennifer Hsieh

Jennifer Hsieh, Ph.D., D.A.B.T. is a Staff Toxicologist (Specialist), in the Branch of Reproductive and Cancer Hazard Assessment, Office of Environmental Health Hazard Assessment (OEHHA), California Environmental Protection Agency (CalEPA) since 2007. Her work specializes in cancer hazard identification and carcinogen risk assessment. She received her B.S. and M.S. degrees in pharmacological science and her Ph.D. from the Environmental Toxicology Program at Michigan State University. She did her post-doctoral training at the Cancer Center, UC Davis. Before OEHHA her research focused on investigating the potential mechanisms of carcinogenesis in breast and prostate cancers. Before her Presidency, Jennifer served as the GETA Treasurer.


Anna Kalishnikova

Anna Kalashnikova is a member in the Risk Assessment Section of the Human Health Assessment Branch at the Department of Pesticide Regulation. She is the lead toxicologist of DPR’s cannabis program, where she evaluates the risk to humans from exposure to pesticides on cannabis and hemp. She is also a member of the California Pesticide Residue Monitoring Program, where she conducts health risk evaluations for exposure to pesticide residues on fresh food commodities, to protect the most sensitive populations, including infants and pregnant women. In addition, Dr. Kalashnikova is part of the team that completed the 2023 risk assessment of the insecticide fipronil. In her free time she enjoys backpacking with her rescue dog, and volunteering at Front Street animal shelter as a dog trainer.

Past President / Website Officer

Sarah Elmore

Sarah Elmore, Ph.D. is an Associate Toxicologist with the Cancer Toxicology and Epidemiology Section of the Office of Environmental Health Hazards Assessment (OEHHA). Sarah's work is focused on cancer hazard identification and risk assessment. Prior to starting her work at OEHHA in 2018, Sarah was a Post-Doctoral Researcher at UC Davis where she investigated the toxicity and carcinogenicity of personal care products and pesticides. Sarah received her Bachelors in Biomedical Science (2010) and PhD in Toxicology (2016) from Texas A&M University. Sarah served as the 2018-2020 GETA Secretary, 2021-2022 GETA President, and is an active member of the Society of Toxicology. She lives in Santa Cruz with her husband and toddler where they enjoy surfing, hiking, biking and fishing.


James Nakashima

As a toxicologist for the Pesticide Environmental Toxicology Branch in the Office of Environmental Health Hazard Assessment, Dr. Nakashima serves as an exposure assessor and expert on pesticide-related illness reporting. Previously, he managed a pre-clinical drug discovery program for Solanan, Inc., and held a faculty position at Brown University in the Department of Pathology and Laboratory Medicine. James received his PhD in Comparative Pathology from UC Davis, and postdoctoral training at Letterman Army Institute of Research and Brown University. His scientific interests include vascular peptide biology, pathogenesis of pulmonary fibrosis and sepsis, and regulation of the immune system.James served as GETA President from 2020-2021.

Secretary/Newsletter Editor

Chunbo Zhang

Chunbo Zhang is an Associate Toxicologist at Human Health Assessment Branch at California Department of Pesticide Regulation. She received her Ph.D in Zoology at University of Manitoba, Canada. Her expertise in neuroscience, molecular biology, developmental biology and cancer biology has been valuable in evaluating toxicity studies and conducting human risk assessment. She likes to read and is keen to testing new ideas for better living.

Member at Large

Vanessa Cheng

Vanessa Cheng, Ph.D. is an Associate Toxicologist in the Cancer Toxicology and Epidemiology section of the Office of Environmental Health Hazard Assessment (OEHHA) and works on cancer hazard identification and risk assessment. Vanessa earned her Bachelor’s in Biology (2017) and PhD in Environmental Toxicology (2021) from the University of California, Riverside, where she investigated the effects of nuclear receptors activation during early stages of development in zebrafish and receptor-mediated genomic, transcriptomic, and metabolomic alterations in human liver carcinoma cells.

University Representative

Weihong Guo

Weihong Guo, M.S, is a Research Specialist and Lab Manager at Children's Environmental Health Laboratory and Berkeley Public Health Biorepository, UC Berkeley. Her academic work focuses on biobanking, molecular epidemiology, epigenetics and studying children’s health in relation to environmental exposures using biomarkers of obesity, oxidative stress, inflammation, and cognitive functions. Before she returned to UC Berkeley, she specialized in analytical chemistry conducting biomonitoring studies on organic pollutants such as PBDE, PCBs, and organic pesticides, and cannabis testing at CA Department of Toxic Substances Control, Department of Public Health, and Department of Cannabis Control. She received her Master of Science degree in Environmental Health Sciences from UC Berkeley.

University Representative

Gabrielle Rigutto

Gabrielle Rigutto is currently a Junior Specialist and assistant to the Research Translation core for the Superfund Research Program at the University of California Berkeley. Her research focuses on novel methods of hazard identification and risk assessment. She completed her MS in Environmental Health Sciences in the School of Public Health at UC Berkeley in 2022, while she also obtained an MS in Environmental Science and policy and bachelor’s in Biochemistry from Clark University in Worcester, MA.

Government Representative

Kim Truong

Kim Truong, Ph.D., is an Associate Toxicologist with the Toxicology and Dose-Response Assessment Section of the California Department of Pesticide Regulation (DPR) at California Environmental Protection Agency (Cal EPA). Dr. Truong’s work is in the conduct of human health risk assessments to predict health effects and their extent in humans under given conditions of exposure, with focus on preparing systematic review of open literature, review of toxicology studies, hazard identification, and dose-response assessment. She received her B.A. in English (2009), B.S. in Biotechnology (2009), and Ph.D. in Pharmacology and Toxicology (2019) at UC Davis, where her research focused on determining the mechanism by which environmental contaminants, such as legacy pollutant DDT, mediate calcium signaling dysregulation in skeletal muscle, cardiac muscle, and the central nervous system in humans. In her free time, she enjoys going on outings with her son, fiancé, and pitbull.

Business Representative

Brett Winters

Brett Winters, PhD, CIH is a project toxicologist in the Toxicology & Safety Pharmacology group at Cytokinetics Inc, a biopharmaceutical company focusing on cardiovascular and musculoskeletal therapies. He specializes in designing, coordinating, monitoring, and reviewing IND-enabling and NDA-enabling toxicology and safety pharmacology studies. Brett also serves as the course director and lecturer of “Introduction to Toxicology” at California State University, East Bay. He received his B.S in Environmental Toxicology from UC Davis, and his PhD in Toxicology from the University of North Carolina at Chapel Hill.

Post-Doc Representative

Dorothy You

Dorothy You is currently postdoctoral researcher at Lawrence Livermore National Lab. Her research focuses on inhalation toxicology from emerging toxicants. Prior to joining LLNL, Dorothy received her bachelor’s degree in chemistry from the University of Illinois at Urbana Champaign and her PhD in toxicology from North Carolina State University. She then moved to UC Davis to start her postdoctoral research.

Student Representative


If interested in this position, please contact Jennifer Hsieh for more information.

1980-1995 1996-2011 2012-Present
1980 - Anthony Carrano 1996 - Andrew Wyrobek 2012 - Greg Brorby
1981 - Robert Hill 1997 - Rob Scofield 2013- Kat Navarro
1982 - James MacGregor 1998 - Kim Hooper 2014- Matt Le
1983 - James Bartholomew 1999 - Janice Yager 2015- Heather Bolstad
1984 - Joseph Brown 2000 - Jim Cleaver 2016- Ouahiba Laribi
1985 - James Felton 2001 - Steve Dizio 2017- Gwen Osborne
1986 - Caroline Sigman 2002 - Melanie Marty 2018- Leona Scanlan
1987 - Martyn Smith 2003 - Melanie Marty 2019- Puttappa Dodmane
1989 - Regine Goth-Goldstein 2004 - Karen Steinmetz 2020 - Maxwell Leung
1990 - Carol Green 2005 - Thomas McDonald 2021 - James Nakashima
1991 - Charles Salocks 2007 - Amy Arcus-Arth 2022 - Sarah Elmore
1992 - James Tucker 2008 - Lida Antonian
1993 - Jon Mirsalis 2009 - Greg Brorby
1994 - Collete Rudd 2010 - George CT Jiang
1995 - George Alexeeff 2011 - Kurt Fehling