His father died when he was 11; at that point he and his sisters, Laura and Brenda, lived in the foster home of the Patricia and Robert Penshorn family and occasionally with his uncle Herbert L. Lewis, the editor of the Saint Paul Pioneer Press.
Ingersoll graduated from the Saint Paul Academy, and earned a bachelor's degree in history from Carleton College.
He went on to the Minneapolis Tribune, and then to be a journalist at the Chicago Sun-Times, where he spent 14 years, including six at the paper's Washington Bureau, in D.C.
Among his noteworthy efforts were the coverage of allegations that led to charges against a former Secretary of Agriculture, Mike Espy, and an article about the continued Federal subsidy of mohair for 35 years after the military stopped using it in uniforms in 1960, a scandal in which he targeted fellow journalist Sam Donaldson for receiving hundreds of thousands of dollars while "absentee" on his inherited ranch.
His article, As Congress Considers Slashing Crop Subsidies, Affluent Urban Farmers Come Under Scrutiny, was read into the Congressional Record.