Mason Phelps Jr

Mason Phelps III (1949 — 19 May 2021), often referred to as "Mason Phelps Jr.", was an American equestrian rider, founder of Phelps Media Group, and an Olympian. He was also president of the National Horse Show.

In 2002 Phelps co-founded the public relations firm Phelps, Wilkes & Associates. Their first client was the National Horse Show, which was moving its location from Madison Square Garden in NYC to Wellington, Florida. In 2004 Phelps founded the Phelps Media Group as an equestrian-oriented public relations agency. It helps equestrian shows put together and market their events, in addition to serving as a public relations representative to members of the equestrian community. In 2011 Phelps was named to the Wellington Chamber of Commerce President's Circle, for building "America's most progressive and successful equestrian public relations firm".

In 1996, after the death of his brother to AIDS, Phelps and Robert Dover founded the Equestrian AIDS Foundation, in order to raise money for those in the equestrian community suffering from HIV/AIDS. The organization has since changed its name to the Equestrian Aid Foundation, as it began also raising and distributing money to those in the equestrian community that have suffered calamitous injuries in the sport. Phelps helped the Florida charity Back to Basics, which provides basic essentials children need to go to school. In addition, he threw charity events and galas, including events in support of the United States Equestrian Team—raising more than a million dollars between 1996 and 2002.

In the early 1970s, Phelps opened a stable and began training hunters and jumpers. He also became an event manager for equestrian shows. He founded the San Antonio AA Rated Xmas Show and the New England Horseman's Association Hunt Seat Medal in Springfield, Massachusetts. Phelps would also become the president of the National Horse Show, where he among other things oversaw the event move its annual location to Lexington, Kentucky. He was also the event organizer for the 2012 World Dressage Masters, and founded the International Jumping Derby.

In 1965, Phelps attended his first United States Equestrian Team Clinic at the age of sixteen. He competed in the World Championships in Ireland, where he earned 12th place. Next Phelps earned a position as an alternate with the US equestrian team on the 1968 Summer Olympics Three Day Eventing squad. That year he was also named U.S. Combined Training Association's Rider of the Year.