Liam Treadwell
Percy Woodland.
The 2008 Grand National was won by the horse Comply or Die, ridden by jockey Timmy Murphy.
Twice
He hasn't. Detori is a flat jockey and doesn't do the jumps.
Red Marauder won the 2001 Grand National. Trained by Norman Mason and ridden by Richard Guest.
niche market
niche market
He won the Aintree Grand National in 2000 and the Irish Grand National in 2000. In 2004 he won the Welsh Grand National. In 2005 he won the Aintree Grand National and the Irish Grand National. So he was won 5 Grand Nationals in total, having won 2 Aintree Grand Nationals, 2 Irish Grand Nationals and 1 Welsh Grand National.
No female jockey has ever won the Aintree Granda National. Jenny Pitman and Venetia Williams both trained winners.
G. Stevens won the Grand National five times, in 1856, 1863, 1864, 1869 and 1870, and won the Kentucky Derby three times, in 1988, 1995 and 1997. Of course, it isn't the same G. Stevens; the Grand National winner was George Stevens and the Kentucky Derby winner was Gary Stevens. But it's probably the closest to an answer you can get, since no jockey has won both races.
HedgeHunter won the grand national in 2007
Northern Irish horse racing jockey Tony McCoy has over 3,000 career wins.