He commenced racehorse training in 1988  having previously worked as an assistant to his father Paddy Mullins and Jim Bolger. Mullins is a former six times amateur champion jockey in Ireland, winning the 1983 Aintree Fox Hunters on Atha Cliath and the 1996 Cheltenham Bumper on Wither Or Which. 
He is the trainer of the 2005 Grand National winner Hedgehunter. He was also trainer of the 2009 David Nicholson Mares' Hurdle champion, Quevega. and Ballymore Properties Novices' Hurdle champion, Mikael d'Haguenet.
- ↑ bbc sport, Horse Racing
- ↑ Willie Mullins at Horse Racing Ireland
- ↑ from Willie Mullins official website
- ↑ "Cheltenham Festival: Punjabi So Brave For Henderson" dailyrecord.co.uk, 11 March 2009, accessed 11 March 2009
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