Background
He was born on a farm near Mount Erie, Illinois, he attended the rural schools, Northern Illinois Normal School, De Kalb, Illinois, and Valparaiso (Indiana) University.
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He was born on a farm near Mount Erie, Illinois, he attended the rural schools, Northern Illinois Normal School, De Kalb, Illinois, and Valparaiso (Indiana) University.
He was graduated from Northern Illinois College of Law, Dixon, Illinois, in 1908.
He taught in the rural schools of Wayne County, Illinois. He was admitted to the bar the same year and commenced practice in Fairfield, Illinois. He was the county judge of Wayne County, Illinois from 1914 to 1926.
He served as assistant attorney general of Illinois 1927-1933.
He served as delegate to the Republican National Convention in 1928. He was an unsuccessful candidate for election to the Seventy-second and Seventy-fourth Congresses.
Heidinger was elected as a Republican to the Seventy-seventh, Seventy-eighth, and Seventy-ninth Congresses and served from January 3, 1941, until his death in Phoenix, Arizona, on March 22, 1945. He was interred in Maple Hill Cemetery, Fairfield, Illinois.