John Bennett Fenn was an American analytical chemist who was awarded a share of the Nobel Prize in Chemistry in 2002, sharing half of the award with Koichi Tanaka for their work in mass spectrometry. His contributions related to the development of electrospray ionization, now a commonly used technique for large molecules and routine liquid chromatography-tandem mass spectrometry. Early in his career, he studied the field of jet propulsion at Project SQUID and focused on molecular beams. He finished his career with more than 100 publications, including one book. The Nobel Prize in Chemistry 2002, announced October 9, 2002. John B. Fenn (1/4), “for their development of soft desorption ionisation methods for mass spectrometric analyses of biological macromolecules”. Koichi Tanaka (1/4), “for their development of soft desorption ionisation methods for mass spectrometric analyses of biological macromolecules”. Kurt Wüthrich (1/2), “for his development of nuclear magnetic resonance spectroscopy for determining the three-dimensional structure of biological macromolecules in solution”. John B. Fenn: born 1917, New York, NY, USA. Koichi Tanaka: born 1959, Toyama City, Japan. Kurt Wüthrich: born 1938, Aarberg, Switzerland. Wiki link Wiki link Wiki link Data: the Nobel Foundation (CC0).