From the early years of the company, Martin hired trained engineers to design his planes and talented managers to run his factories. The Martin Company provided training and experience to a remarkable number of other aviation manufacturers who later struck out on their own. William Boeing, Donald Douglas, Lawrence Bell, and James S. McDonnell founded companies that bear their names. Charles Day, chief designer for Standard Aircraft in World War I, and Charles Willard, co-founder of L.W.F. Engineering in 1917, were both former Martin employees as were J.H. Kindleberger and C.A. Van Dusen, who ran North American and Brewster, respectively, during World War II.
Glenn Martin had a taste for large planes, and his company came to depend on military orders. As these pages will testify, this meant bombers. The vast majority of the more than 11,000 planes built by the company before it ceased producing aircraft in 1960, "Martin Bombers" pioneered the doctrine of airpower in the 1920's and '30's and served in all theaters in World War II. Martin Marietta, corporate successor to the Glenn L. Martin Aircraft Company, continued to be a major defense contractor, producing missiles, space hardware, guidance systems, sonar, and avionics. Through its merger with Lockheed in 1995, it rejoined the ranks of aircraft builders.