Walsh was a successful amateur jockey before he turned his hand to training.
Base: Kill, Co Kildare
National best: First
2001-2002 wins: 21 (Ire)
2000-2001 wins: 14 (Ire)
1999-2000 wins: 12 (Ire)
Main jockey: Ruby Walsh
Stable stars: Rince Ri, Commanche Court
He won the Irish amateur championship 11 times in a career in the saddle that saw him take in four victories at the Cheltenham Festival.
His greatest moment as a trainer came at Aintree three years ago.
In partnership with his son, Ruby, Walsh followed the lead of Tommy and Paul Carberry 12 months earlier to land a father-and-son Grand National win in 2000.
Walsh senior described the experience of seeing Papillon and his son taking victory as a "fairytale".
The pair went on to finish fourth in heavy mud behind Red Marauder 12 months later.
Despite figuring in the early ante-post betting, Papillon was withdrawn from this year's renewal and has now been retired.
Those results with Papillon came almost a decade after Walsh's debut, and only previous appearance as a trainer at Aintree, when Roc De Prince finished 17th.
Three finishes from three starts is proof enough that Walsh knows what it takes to get a horse through one of the sport's most gruelling races.
More recently, other strong performers like Commanche Court and Rinci Ri have come out of the Walsh yard.
Commanche Court gave him his only Festival winner in the 1997 Triumph Hurdle and came second in the Gold Cup in 2002.