STEER Program Leadership
Assistant Researcher, Sadie Costello, PhD
Director, STEER Program
Sadie Costello is an epidemiologist with an interest in environmental and occupational exposures, chronic disease and the use of directed acyclic graphs and causal inference to understand and reduce bias. She received her PhD in epidemiology from the University of California, Los Angeles in 2008 before coming to UC Berkeley. Sadie's research at UC Berkeley has focused on studying a range of health outcomes from occupational exposures in large cohort studies of industrial workers including aluminum workers, metal machinists, and miners. Sadie is an integral part of a multidisciplinary team that works to address several prevailing biases in occupational epidemiology including competing risk, direct and indirect effects, and survivor bias. She is a leader of the epidemiology and biostatistics core for a Children's Environmental Health Center and supports established academics to conduct analysis of the health effects of air pollution on children's health that allow for a causal interpretation. Sadie has co-mentored students involved in occupational studies of heart disease and cancer due to particulate matter generated in the occupational setting.
Professor Michael Bates, PhD
Associate Director, STEER Program
Dr. Bates is Adjunct Professor of Epidemiology in the School of Public Health, but based in the Division of Environmental Health Sciences. Dr. Bates had a background in chemistry and toxicology before obtaining his PhD in epidemiology at Berkeley. He currently teaches an intensive class in epidemiologic methods during the summer and also during the fall in the School of Public Health’s online MPH program. His research focus is on the health effects of occupational and environmental exposures to chemicals. Dr. Bates is Principal Investigator of two NIH-funded epidemiology studies being carried out in Nepal. These studies are investigating whether household air pollution from cooking and heating fires and kerosene lighting are associated with pulmonary tuberculosis or eye diseases. Other studies in which he is currently involved include an epidemiologic study in the Bay Area of whether exposures to n-hexane solvent in automotive parts cleaners cause persistent neurological or reproductive effects, and a study in the Rotorua geothermal area of New Zealand into whether long-term, low-level exposure to hydrogen sulfide is responsible for effects on the respiratory and neurological systems or the eyes.
Other areas of research interest of Dr. Bates include health effects of organochlorine compounds, such as dioxins and PCBs; whether dental amalgam fillings, which contain mercury, cause any health effects; cancer risks in fire fighters, and cancer risks associated with ingestion of arsenic in drinking water.
Gayle Cepparo, MA
STEER Project Coordinator
Gayle Cepparo is the Administrator of the Center for Occupational and Environmental Health (COEH). She has been with COEH for ten years. Prior to coming to UC Berkeley she worked in law firm administration.
Gayle is the administrator of the Northern California ERC Training Center (a multi-campus center) and works closely with the 35 student and resident trainees who are a part of that training grant. She oversees the student awards programs offered through COEH, is the Project Coordinator of the STEER program, provides financial support to the COEH Continuing Education Program, and provides administrative and financial support to the Labor Occupational Health Program.