Marc Stifelman has worked as toxicologist at EPA or more than 20 years.  He prepares risk assessments with a focus on environmental exposures to heavy metals.  He started at EPA working on the Bunker Hill Smelter and Coeur d’Alene River assessments and has migrated downstream to the Spokane and Columbia Rivers.  When he’s not working on a river he’d rather be surfing or swimming in the ocean.