Following George W. Mason's unexpected death in the fall of 1954, George Romney (whom Mason had been grooming as his eventual successor), succeeded him as president and CEO of the newly formed American Motors. Romney recognized that to be successful in the postwar marketplace, an automobile manufacturer would have to be able to produce and sell cars in sufficient volume to amortize the high cost of tooling. Toward that end, he set out to increase AMC's market share with its Rambler models that were selling in market segment in which the domestic Big Three (General Motors, Ford Motor Company, and Chrysler) automakers did not yet compete. While the development of a redesigned 1958 Nash Ambassador, based on a stretched and reskinned 1956 Rambler body was almost complete, AMC's designers were also working on a retrimmed Hudson equivalent, called Rebel, to offer Hudson dealers.