Thomas M. Mack, MD, a professor of preventive medicine and pathology at the University of Southern California (USC) and an emeritus member of the AACR, died June 22, 2025. He was 89 years old.
Born in Reno, Nevada, in 1936, he attended Carleton College in Minnesota and earned a medical degree from Columbia University’s Vagelos College of Physicians and Surgeons.
Mack worked for the U.S. Centers for Disease Control and Prevention (CDC) and conducted studies of smallpox epidemiology in Bangladesh. He joined the faculty of the Harvard School of Public Health and then moved to USC’s Department of Population and Public Health, where he remained for 47 years.
He was among the faculty who launched the USC Cancer Surveillance Program to collect and analyze information on all new diagnoses in Los Angeles County. He was founder and director of the International Twin Study and the California Twin Program to compare patients with cancer and other chronic diseases and their unaffected twins. He served for nearly 30 years on the California Carcinogen Identification Committee, which identifies cancer-causing chemicals.
He had been a member of the AACR since 2001 and a member of the editorial board of Cancer Epidemiology, Biomarkers & Prevention.
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