Michael Grunstein (born 1946, in Romania) is a Distinguished Professor Emeritus of Biological Chemistry at the David Geffen School of Medicine at UCLA. The only surviving child of Holocaust survivors, he obtained his Bachelor of Science degree from McGill University in Montreal, and his PhD from the University of Edinburgh, Scotland. He did his post-doctoral training at Stanford University in Palo Alto, California, where he invented the colony hybridization screening technique for recombinant DNAs in David Hogness' laboratory.