Three-time USEF CCI5*-L Eventing National Champion with Mystic Mike in 2003, My Boy Bobby in 2009, and Ballynoe Castle RM in 2013.

With Ballynoe Castle RM (AKA Reggie), Davidson competed in the 2010 and 2014 Alltech FEI World Equestrian Games™ for the Land Rover U.S. Eventing Team.

In 1999, he made his U.S. team debut at the Pan American Games with Pajama Game and competed in his second Pan American Games in 2011, riding Absolute Liberty to team gold and individual bronze medals.

Winner of the Markham Trophy as the highest-placed young rider in a USET Championship three times, and was the 1996 Young Rider of the Year.

Buck and his wife, Andrea, run BDJ Equestrian in Ocala, FL during he winter season and are based during the summer in Riegelsville, PA. They have two daughters, Aubrey and Ellie.