Professor Thomas N. Seyfried is an American professor of biology, genetics, and biochemistry at Boston College. He received his PhD from the University of Illinois Urbana-Champaign in 1976. His postdoctoral fellowship studies were in the Department of Neurology at the Yale University School of Medicine where he served as an assistant professor in neurology. He did undergraduate work at the University of New England, formerly St. Francis College, and received a master's degree in genetics from Illinois State University, Normal.

His research focuses on mechanisms of chronic diseases such as cancer, epilepsy, neurodegenerative lipid storage diseases, and caloric restriction diets. Thomas N. Seyfried has been published in over 150 peer-reviewed publications. He previously served as chair, Scientific Advisory Committee for the National Tay-Sachs and Allied Diseases Association and presently serves on several editorial boards, including those for Nutrition & Metabolism, Neurochemical Research, the Journal of Lipid Research, and ASN Neuro. His 2012 book is Cancer as a Metabolic Disease: On the Origin, Management, and Prevention of Cancer. Seyfried is a popular interview guest regarding the topic of cancer.