Career
Born in Hazel Green, Wisconsin, Eastman worked in a bank and lumberyard in Cobb, Wisconsin. He also worked in lumberyards in other places in Wisconsin: Mineral Point, Montfort, and Lancaster, Wisconsin. He was president of the Eastman Cartwright Lumber Company and the Livingston Lumber Company in Livingston, Wisconsin.
Eastman also was a farmer and cattle breeder.
Eastman served on the Lancaster Common Council from 1906 to 1914 and then on the Grant County Board of Supervisors. Eastman was chairman of the county board.
Eastman served in the Wisconsin State Assembly in 1927 and 1929 and was a Republican. Eastman died in Lancaster, Wisconsin.