 On his death in 1890, McIlhenny was succeeded by his eldest son, John Avery McIlhenny, who expanded and modernized the business, but resigned after only a few years in order to join Theodore Roosevelt's 1st US Volunteer Cavalry Regiment, the Rough Riders.On John's departure, brother Edward Avery McIlhenny, a self-taught naturalist fresh from an Arctic adventure, assumed control of the company and also focused on expansion and modernization, running the business from 1898 until his death in 1949.Walter S. McIlhenny in turn succeeded his uncle Edward Avery McIlhenny, serving as president of McIlhenny Company from 1949 until his death in 1985.