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Venturi played quarterback at Rockford Auburn High School in Illinois as a sophomore and junior, and then at Pekin High School for his senior year before enrolling at Northwestern. While at Northwestern he joined the Delta Upsilon fraternity. His father, Joe Venturi, was a member of the Illinois High School Football Coaches Hall of Fame. Joe coached at Pekin High School in Illinois. His brother, John is also a member of the Illinois High School Football Coaches Hall of Fame. John coached at Washington High School where he won the 1985 Class 4A State Championship. John's 1983 Washington team was the 4A Runner-Up.