Jack began riding early, and during his teenage years competed as a steeplechase jockey, as well as showing in dressage, showjumping, and eventing.

During his time as coach, Le Goff had complete control over the US eventing team including selection, training and pairing of horses and riders.

[1] After retiring as the American coach, he spent five years in Hamilton, Massachusetts as the Director of the United States Equestrian Team (USET) Training Center.

[2] In 1983, Le Goff was named Horseman of the Year by the American Horse Shows Association (the predecessor to the United States Equestrian Federation).

[5] In 1999, he was inducted into the United States Eventing Association's Hall of Fame,[9] followed by being named as one of the 50 most influential horsemen of the twentieth century by the equine magazine Chronicle of the Horse in 2002.

[10] In 2009, after his death, the USET announced the creation of the Jack Le Goff Memorial Fund, to provide travel grants to United States riders competing at the FEI Eventing World Cup Final.

[11] Veteran US Olympic riders such as Michael Page and Mike Huber cite Le Goff as having a large impact on American eventing.

[14] Denny Emerson, another top US eventing rider, called Le Goff a "tactician, consensus builder, consummate horseman, outrageous flirt, teller of terrible jokes, promoter, master chef, father, fisherman, and probably that most defining persona of all, the quintessential French male bon vivant.