Shanna Swan

Shanna Helen Swan (born May 1936) is an American environmental and reproductive epidemiologist who is Professor of Environmental Medicine and Public Health at the Icahn School of Medicine at Mount Sinai, where she has taught since April 2011.

In 2017, a paper on which Swan was senior author on environmental contributions to sperm count and the male infertility crisis received significant attention in both the popular media and scholarly literature, becoming the world's 26th most referenced scientific paper published that year. She has also researched the effects of environmental chemicals and pharmaceutical drugs on the development of the human reproductive system.

In 2021, with journalist Stacey Colino, Swan co-authored the book Count Down: How Our Modern World Is Altering Male and Female Reproductive Development, Threatening Sperm Counts, and Imperiling the Future of the Human Race, which discusses declining sperm counts in men and attributes this decline to endocrine-disrupting chemicals.

Personal life Swan was married to David A. Freedman, with whom she had two children: Joshua Freedman and Deborah Freedman Lustig. She had a third child, Christo Swan, after marrying Henry Swan III. She later married Steven R. Brown.