[4] After graduating from Dartmouth, Treadway served as the manager of the Glenburnie Inn in East Lake George, New York.

After two years in Vero Beach, Treadway sold his shares in the inn to his father and left the hotel business to become an instructor at St. Lawrence University.

In 1941, Treadway left SLU to manage the cafeteria of the Fellows Gear Shaper Company in Springfield, Vermont.

[2] Treadway later served in the United States Marine Corps for two years during World War II.

[2] After the Convention, Treadway was asked to run for the Massachusetts Senate seat in the Worcester and Hampden District.

His third marriage to Peggy Simmons, the daughter of Huntington Hardwick and the granddaughter of financier and philanthropist Galen Stone, lasted from 1982 until her death in 2005.