William Scott Elam , stage name Jack Elam, was born in Miami in Gila County in south central Arizona, to Millard Elam and Alice Amelia Kirby. His mother died in 1922 when Jack was two years old. By 1930, he was living with his father, older sister Mildred, and their stepmother, Flossie Varney Elam.

He was a student at both Miami High School in Gila County and Phoenix Union High School in Maricopa County, graduating from there in the late 1930s.

Elam attended Santa Monica Junior College in California. After that, he worked as a bookkeeper at the Bank of America in Los Angeles and as an auditor for the Standard Oil Company. In World War II, he served two years in the United States Navy and subsequently became an independent accountant in Hollywood; one of his clients was movie mogul Samuel Goldwyn. At one time, he was the manager of the Bel Air Hotel in Los Angeles.

In 1949, Elam made his debut in She Shoulda Said No!, an exploitation film in which a chorus girl's marijuana smoking ruins her career and drives her brother to suicide. He appeared mostly in westerns and gangster films playing villains.

He was married twice, first to Jean Elam from 1937 to her death in 1961 and second, Margaret Jennison from 1961 until his death in 2003. Jack Elam had two daughters, Jeri Elam and Jacqueline Elam, and a son, Scott Elam. Elam died in Ashland, Oregon, of congestive heart failure, a month before he would have turned 83.

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