Emerson grew up in
Massachusetts and began riding around the age of nine at the
Stoneleigh-Burnham School in
Greenfield, Massachusetts, where his father was headmaster. Emerson began competing in
gymkhanas in 1954, at the age of 12. He began eventing in 1961 at the age of 20. His first event was a preliminary three-day at GMHA. In 1965 Emerson moved up to the Intermediate Level on his first event horse Lighting Magic, and by 1971 he had moved up to the Advanced Level on Cat. Emerson and Cat competed in their first advanced three-day at
Dunham, Quebec. In 1972, Emerson was named the
United States Eventing Association's Rider of the Year. That same year Emerson and Viktor Dakin won the National Three Day Event Championships at Radnor. Emerson won the National Three Day Event Championship again in 1979 at Chesterland riding York. York was then named USEA's 1979 "Horse of the Year". In 1982 Emerson placed fourth at the US National Three Day Event at Chesterland, riding Farnley Rob Roy. In 1992, Emerson won the Bromont CCI** event. Emerson competed at his final advanced three day at Groton House Farm in
South Hamilton, Massachusetts in 1999 at the age of 58. His advanced career lasted 29 seasons. In 2004 Emerson earned a
Tevis Cup buckle for completing the 50th Anniversary of the
Western States Trail Ride, a 100-mile endurance race. and competed in
dressage and jumper shows. In 2011 Emerson completed his 50th consecutive season as an entry in the Preliminary or Federation Equestre Internationale (FEI) CCI* level. That same year, however, Emerson broke his C1
vertebrae after falling during the cross country phase of an event at the Stoneleigh-Burnham School Horse Trials in late July. Emerson made a full recovery and, as of 2015, continues to regularly school horses and compete in both jumper and
dressage shows. Emerson served as USEA president from 1982-1984 and again from 1991-1992. He also served as the
United States Equestrian Team's Vice President of Eventing for seven years, and was a member of the
United States Eventing Association's Executive Committee, and the Chairman of the Breeder's Committee of the
American Horse Show Association (AHSA). Dorothy Trapp, the 1994 Individual
World Championship silver medalist; David O'Brien, the 1996 winner of Bromont; and Nancy Bliss, a team bronze medalist at the 1982
World Championships. The Adult Camp program expanded since its start, with programs being run throughout the year at both farm locations. ==Personal life==