Sarkis Mazmanian

Sarkis Mazmanian is an American medical microbiologist who has served as a professor at the California Institute of Technology since 2006. He is currently the Luis & Nelly Soux Professor of Microbiology in the Division of Biology and Biological Engineering, and a board member of Seed. Prior to this, Mazmanian was affiliated with Harvard Medical School and the University of Chicago. In 2012, Mazmanian was awarded a MacArthur Fellowship for his pioneering work on the human microbiome.

Mazmanian's research investigates the symbiotic relationship between beneficial bacteria and their hosts. In seminal work, Mazmanian discovered the first microbial molecule that has direct beneficial effects on mammals. Working in Dennis Kasper's lab, he showed in 2005 that a particular bacterial species, Bacteroides fragilis, from the human microbiome augments immune function and balances a dysregulated immune system. Mazmanian has described and defined a novel paradigm in science whereby the gut microbiome intricately controls the development and function of the mammalian immune system. These discoveries include the demonstration that B. fragilis can treat experimental inflammatory bowel disease by inducing the activity of protective, regulatory immune cells. Further, his laboratory revealed that the gut microbiome impacts autoimmune diseases such as experimental multiple sclerosis.

Mazamanian was born in Lebanon to two Armenian refugees, moving to the US in 1973 whilst a toddler. He enrolled at UCLA in 1990, planning to major in English, before focusing on microbiology. He graduated in 1995 having majored in microbiology, before enrolling on a PHD which he concluded in 2002. He was awarded a Helen Hay Whitney Postdoctoral Fellowship at Harvard Medical School, before moving to Caltech in 2006, where he established the microbiome department.