His company, Ingersoll Publications, founded in 1957, was taken over by his son Ralph M. Ingersoll Jr. in 1982 after he had bought his father out in a deal that left them no longer on speaking terms.
His business, Ingersoll Publications, established in 1957, was succeeded by his son Ralph M. Ingersoll Jr. in 1982 after he bought out the company, leading to their estrangement.