Sir John Henry Gaddum FRS (31 March 1900 - 30 June 1965) was a British pharmacologist. He was educated at Rugby School

Rugby School

Rugby School is a co-educational day and boarding school located in the town of Rugby, Warwickshire, England. It is one of the oldest independent schools in Britain.-History:...

 and Trinity College, Cambridge

Trinity College, Cambridge

Trinity College is a constituent college of the University of Cambridge. Trinity has more members than any other college in Cambridge or Oxford, with around 700 undergraduates, 430 graduates, and over 170 Fellows...

. He became professor

Professor

A professor is a scholarly teacher; the precise meaning of the term varies by country. Literally, professor derives from Latin as a "person who professes" being usually an expert in arts or sciences; a teacher of high rank...

 of pharmacology at the University of Cairo

Cairo University

Cairo University is a public university located in Giza, Egypt.The university was founded on December 21, 1908, as the result of an effort to establish a national center for educational thought...

. Subsequent to this he took up a chair at University College London

University College London

University College London is a public research university located in London, United Kingdom and the oldest and largest constituent college of the federal University of London...

. He later worked at Porton Down

Porton Down

Porton Down is a United Kingdom government and military science park. It is situated slightly northeast of Porton near Salisbury in Wiltshire, England. To the northwest lies the MoD Boscombe Down test range facility which is operated by QinetiQ...

. He is best remembered for his classic work "Gaddum's Pharmacology". He is the first scientist postulated that 5-HT might have a role in mood regulation.

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