Born 22nd February 1975 in Norwich.
Warren is the youngest son of Julian (farmer) and Val Greatrex (teacher). He was brought up on Dartmoor and attended The Spooner & West Dartmoor Pony Club. Warren also played county rugby, cricket and hockey. After A-Levels, decided against university and started work for David ‘The Duke’ Nicholson.
He worked and rode for Josh Gifford, Lady Herries and David Gandolfo where he rode 13 winners. Then Warren worked as Head Lad for Bryan Smart until he moved to Thirsk. After a period riding out for Jamie Osborne he was approached by Oliver Sherwood who he was with for 9 years. He also gained experience during the holiday periods working for Michael Hourigan, Sean Woods and Guillaume Macaire in France.
He was head hunted by Mr Malcolm Denmark to train at Weathercock House, which he did for three seasons before deciding to leave and start up at Uplands with 15 horses in 2012.
Warren has twins Tom and Ed along with Evie, Nell and Nancy .
Warren enjoys all sports and is a keen Spurs fan and enjoys playing golf when he gets the time.