Whilst a competitive ice dancer Russ Witherby was best known for competing with April Sargent-Thomas. They skated together at the senior national level from 1988-92, placing on the podium all five years at the US Championships. They were third in 1988, second in 1989-91, and won the title in 1992. Sargent-Thomas and Witherby competed at four World Championships, placing eighth in 1990, and ninth in 1991-92. Prior to dancing with Sargent-Thomas, Witherby skated with Lois Luciani, placing third in dance at the 1986 US Championships. After 1992, Witherby joined with Susie Wynne, placing second at the US Nationals in 1993-94, and finishing 15th at the 1993 World Championships. Witherby became a skating coach at the Toyota Sports Center in El Segundo, California.