Career
Stillwell competed in his first race in 1947 at the Ballarat Airstrip circuit, driving an MG TC. He also placed fifth in the 1956 Australian Tourist Trophy against international opposition. He subsequently raced Maserati, Aston Martin, Cooper and Repco Brabham cars. Stillwell drove an Aston Martin DB4 GT Zagato in the 1961 Le Mans 24 Hour Race with fellow Australian Lex Davison but the car did not finish.
He was also victorious in the Australian Tourist Trophy in 1961 and 1962 in a Cooper Monaco and the 1965 Australian One and a Half Litre Championship with a Repco Brabham.
Stillwell retired from motor racing at the end of the 1965 season. He later participated in historic races in Australia and the United States.
Complete Tasman Series results
Stillwell opened an automotive dealership selling MGs in 1949 and subsequently obtained a Jaguar franchise. A Holden dealership followed, and was to become one of the largest in the Australia.
A switch from Holden to Ford in 1966 was followed by the establishment of Stillwell Aviation in 1967 with distribution rights for Beechcraft and later Learjet aircraft.
Stillwell moved to the United States in 1979 to take on the role of vice-president of the Gates Learjet Corporation and went on to became president of the company. He later established luxury car dealerships including a Bayerische Motoren Werke franchise and a Jaguar franchise at Doncaster. Stillwell was married with five children.