Dennis grew up in Cincinnati, Ohio before attending Gulf Coast Jr. College in Panama City, Florida where he was a first team All American. From there he attended Drake University where he graduated and was first team All Missouri Valley. Dennis then was drafted by the NY Knicks in 1973 and was part of the Knicks organization from 1974-1976.

From there he played in Europe and finished his career in the Eastern League now the CBA. Dennis went on to get his MBA from Grand Valley State University after starting Recreational Debut in 1984.