At George Washington, he compiled a 319–237 record in basketball, or .574 winning percentage, including a 23–3 season in 1953–54. His teams twice made the NCAA tournament, in 1954 and 1961, George Washington's only trips to the NCAA Tournament until Mike Jarvis's team in 1993. Players he coached at George Washington included future Basketball Hall of Famer Red Auerbach and future National Basketball Association (NBA) players Joe Holup, Corky Devlin and Gene Guarilia and at Oregon he coached Howard Hobson. Auerbach said Reinhart's coaching and fast break offenses were "15 years ahead of their time."
Reinhart also was head football coach at George Washington and the United States Merchant Marine Academy, assistant football coach at Oregon, and head baseball coach at Oregon and George Washington.
A collection of papers and memorabilia related to Reinhart is housed in the Special Collections Research Center of The George Washington University. The collection includes correspondence, photographs, certificates, and news clippings. The material ranges in date from 1920 to 1993.
National champion Postseason invitational champion
Conference regular season champion Conference regular season and conference tournament champion
Division regular season champion Division regular season and conference tournament champion
Conference tournament champion