Background
Jennens was born in Solihull, United Kingdom.
Jennens was born in Solihull, United Kingdom.
He attended Oundle School and in 1947 went up to Clare College, Cambridge.
He was a medical doctor. In eights racing, Jennens stroked the Clare crew that rowed Head of the River in the 1949 May Bumps. He rowed in the number two seat of the 1950 winning Cambridge crew, and then returned to the stroke seat for the Cambridge victory of 1951.
The umpire had ordered a re-row of the 1951 race after Oxford sank in treacherous conditions.
This crew went on to row as Great Britain in the 1952 Summer Olympics in Helsinki, finishing fourth. Jennens qualified as a doctor at Street Thomas" Hospital in London.
He worked for a while in Canada, before returning to general practice in Cambridge. He was a Steward of Henley Royal Regatta, and he coached many rowing crews from Cambridge University, Clare Boat Club, and Cambridge town clubs.