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.
Ingersoll Publications, which his company founded in 1957, was taken over by Ralph M. Ingersoll Jr., his son, in 1982 following a deal where he purchased his father's shares and they ceased communication.