Trichloroethylene (TCE) and related chemicals like perchloroethylene (PCE) have been used widely for a variety of commercial purposes over the past century, and these chemicals are prevalent in the air, water, and soil. Over the past several decades, mounting evidence has been published linking exposure to TCE/PCE with adverse health effects, including cancer and Parkinson's disease. In this episode, Dr. Sam Goldman discusses his research on environmental risk factors for Parkinson’s disease, focusing on recently published studies examining Parkinson's disease risk in Veterans at Camp Lejeune and also a cluster analysis investigating parkinson's disease diagnoses in people who worked near a contaminated site. Sam is a Professor in the Division of Occupational, Environmental, and Climate Medicine and the Departments of Medicine and Neurology at the University of California, San Francisco (UCSF). He is also a Principal Investigator in the San Francisco Veterans Affairs Medical Center. This podcast is geared toward researchers and clinicians. If you live with Parkinson’s or have a friend or family member with PD, listen to The Michael J. Fox Foundation Parkinson’s Podcast. Hear from scientists, doctors and people with Parkinson's on different aspects of life with the disease as well as research toward treatment breakthroughs at https://www.michaeljfox.org/podcasts.