 In 1927, Spalding's Official Pacific Coast Interscholastic Foot Ball Guide reported that "Charles Dvorak, the renowned player of former years on Yost's University of Michigan team," was coach at Roosevelt High School.Dvorak compiled an overall record of 42-27-18 in 15 years as a high school football coach.In 1934, Dvorak retired from coaching football to devote his time to basketball and track.