Erwin Hahn (born 1921) is a U.S. physicist, best known for his work on nuclear magnetic resonance (NMR). He has been Professor Emeritus at the University of California at Berkeley since 1991 and was professor of physics, 1955-91. 1921 (MCMXXI) was a common year starting on Saturday (see link for calendar). ... Pacific Northwest National Laboratorys high magnetic field (800 MHz, 18. ... A professor is a senior teacher and researcher, usually in a college or university. ... The University of California, Berkeley (also known as Cal, UC Berkeley, UCB, or simply Berkeley) is a prestigious, public, coeducational university situated in the foothills of Berkeley, California to the east of San Francisco Bay, overlooking the Golden Gate and its bridge. ...