Shanna H. Swan, PhD, is one of the world's leading environmental and reproductive epidemiologists and a professor of environmental medicine and public health at the Icahn School of Medicine at Mount Sinai in New York City. An award-winning scientist, her work examines the impact of environmental exposures, including chemicals such as phthalates and bisphenol A, on men's and women's reproductive health and the neurodevelopment of children. For more than twenty years, Dr. Swan and her colleagues have been studying the dramatic decline in sperm count around the world and the impact of environmental chemicals and pharmaceuticals on reproductive tract development and neurodevelopment. Her July 2017 paper "Temporal Trends in Sperm Count: A Systematic Review and Meta-Regression Analysis" ranked #26 among all referenced scientific papers published in 2017 worldwide. Dr. Swan has published more than two hundred scientific papers and myriad book chapters and has been featured in extensive media coverage around the world. Her appearances include ABC News, NBC Nightly News, 60 Minutes, CBS News, PBS, the BBC, PRI, and NPR, as well as in leading magazines and newspapers, ranging from the Washington Post to Bloomberg News to New Scientist. You can find her at shannaswan.com.