Hildensperger earned four varsity football letters at Ferris from 1946-50 and served as the squad's team captain in both the 1947 and 1948 seasons. He started all but one game during his four year career. The lone exception came when he once suffered an appendix attack. While he did not start that particular contest, he did come back to play the entire second half. He helped Ferris post back-to-back winning seasons in 1946 and 1947 with 4-3-2 and 6-2-1 marks, respectively, under head coach Bob Sherman. The Bulldogs also received a postseason bowl game berth in 1947. Hildensperger tallied three touchdowns for 18 total points in 1946 and then added six TD's for 36 points the following campaign. He began his Ferris career after receiving an honorable discharge from the United States Marine Corps following a four-year stint. The Wausau, Wis., product was named Most Valuable Player in the 1947 homecoming contest versus Wisconsin-Milwaukee after scoring three touchdowns. He received honorable mention honors on the Michigan Small College All-Star list in 1948 from his end position. Following college, he went on to serve for a year in the Korean War and then became auditor general of the air force at the Areo Products Division of General Motors in Ohio. He also was employed at the Ternstedt Division of General Motors in Flint for 28 years as a supervisor of production material inventories. While in Flint, he coached a Greater Flint Hockey Association youth team in addition to little league baseball. He retired from GM after 30 years and currently lives in Grand Blanc, Mich., along with his wife, Dolores.