Fred McLafferty
Fred Warren McLafferty (May 11, 1923 – December 26, 2021) was an American chemist known for his work in mass spectrometry. He was best known for the McLafferty rearrangement reaction that was observed with mass spectrometry.  With Roland Gohlke, he pioneered the technique of gas chromatography–mass spectrometry. He is also known for electron capture dissociation, a method of fragmenting gas phase ions. In 1982, he became a member of the National Academy of Sciences.