As of August 4, 2026, no new social media or news activity has been recorded for John Essigmann. John M. Essigman is an American chemist, currently the William R. & Betsy P. Leitch Professor in Residence of Chemistry, Toxicology, and Biological Engineering at the Massachusetts Institute of Technology. StarFeed checks for new updates every few minutes. Use the day-by-day view above to see activity from other dates.