Tammy Tan is a researcher at Lead Exposure Elimination Project (LEEP) who has been working on the organisation’s cost-effectiveness analysis and researching opportunities for LEEP to expand its impact. She was previously a research fellow at the United States Environmental Protection Agency (US EPA), and National Bureau of Economic Research (NBER), investigating a range of questions in environmental and health economics. At the US EPA, Tammy was involved in a number of high-profile projects, including the release of the Biden Administration’s 2021 updated Social Cost of Greenhouse Gases (SC-GHG) estimates. She has led and co-authored papers published in Nature and Science. Tammy graduated from the Wharton School of the University of Pennsylvania with a degree in Economics, concentrating in Statistics.