Bradley joined General Motors during his last semester at Pratt and moved to Detroit in July 1962. It was against company policy to publish designs for Hot Rod and Custom magazines while working for GM, so Harry continued to publish his design under the false name Mark Fadner. Soon after joining General Motors, Bradley met the
Alexander Brothers and developed a relationship that would result in more than ten Bradley-designed custom cars over the next eight years, including the 1964 Alexa (credited by Alexander Bros. to Designer X) and the 1967
Dodge Deora, initially designed in 1964. At GM Bradley undertook a fellowship study program for a master's degree at Stanford University. After only four years at GM, in 1966 Bradley moved to
Mattel which allowed him to return to California. He designed a new range of die-cast model cars which were released in 1968 as
Hot Wheels. Not expecting the models to be a success, he left Mattel in 1969 to start up his own company and also taught at the
Art Center College of Design in Los Angeles. Bradley died on May 13, 2023, at the age of 83. ==Designs==