From Maxwell-Chalmers, Mason went to Copeland Products of Detroit in 1926 before becoming the president of the Kelvinator Corporation, a leader in the emerging electric refrigeration industry.

Under Mason, Kelvinator quadrupled its profits and became second only to General Motors Frigidaire product line in home refrigeration sales despite the effects of the Great Depression.

Continuing Charles Nash's decades of success by building cars "embodying honest worth ... [at] a price level which held out possibilities of a very wide market.

With the market flooded by inexpensive cars, Studebaker, Packard, Willys, Hudson, Kaiser Motors, and Nash were all unable to sell their vehicles at loss leader prices to keep up with Ford and GM.

Mason brought together Nash and the Hudson Motor Car Company to cut costs and strengthen their sales organizations to meet the intense competition from the Big Three.

[9] Within months after the formation of AMC, George Mason died on October 8, 1954, at age 63 of acute pancreatitis and pneumonia in Detroit, Michigan, and was buried in White Chapel Memorial Cemetery.

According to Mason's obituary in Time magazine, had AMC and Studebaker-Packard joined, it would have resulted in the second largest automaker in the world, behind General Motors.

[11] Following his death it was disclosed that Mason, a former president of Ducks Unlimited, had left a gift to the Michigan Department of Natural Resources consisting of 1,500 acres (6.1 km2) land with 14 miles (23 km) of shoreline along the Au Sable River.