He commenced racehorse training in 1988  having previously worked as an assistant to his father Paddy Mullins and Jim Bolger. Willie is a former six times amateur champion jockey in Ireland, winning the 1983 Aintree Fox Hunters' Chase on Atha Cliath and the 1996 Cheltenham Bumper on Wither Or Which.
He is the trainer of the 2005 Grand National winner Hedgehunter and the 2011 and 2013 Champion Hurdle winner Hurricane Fly and trained the horse, Vautour in the 2016 Ryanair Chase. He is also trainer of the six times David Nicholson Mares' Hurdle champion, Quevega. and Ballymore Properties Novices' Hurdle champion, Mikael d'Haguenet. In 2015 Willie Mullins became the first trainer to train the top 3 horses in the Champion Hurdle. In the 2015 Cheltenham Festival Willie Mullins trained 8 winners which is a record at the Cheltenham Festival.
Willie Mullins has a son, Patrick Mullins, who is currently an Amateur Jockey riding mainly in Ireland for his father. Mullins' long lasting relationship with Gigginstown House Stud came to an end on 28 September 2016.
Statistics on Mullins' performance are here
- Clower, Michael (2007). Kings of the Turf. London: Arum Press Ltd. p. 39. ISBN 1845132793.
- bbc sport, Horse Racing
- Willie Mullins at Horse Racing Ireland
- from the Willie Mullins official website
- "Cheltenham Festival: Punjabi So Brave For Henderson" dailyrecord.co.uk, 11 March 2009, accessed 11 March 2009
- "Willie Mullins Champion Hurdle 1-2-3". Daily Mail. Retrieved 14 March 2015.
- "Trainer Willie Mullins scoops eighth win to break festival record". Irish Mirror. Retrieved 14 March 2015.
- Willie Mullins' Official Website
- Willie Mullins' Cheltenham Festival Winners
- Willie Mullins' Horses in training
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