Co-founder of the toymaking company Mattel. He brought to the public Barbie dolls and Hot Wheels cars.
He founded an unexpectedly lucrative business in dollhouse furniture and started Mattel with Harold Matson, whose named formed the Mat of the company's name.
His die-cast Hot Wheels cars were designed by real General Motors engineers with special attention placed on the plastic wheels that rolled.
His wife was a driver of innovation in the company, creating the Barbie doll over her husband's doubts. She named her Barbie doll after their daughter Barbara and the Ken doll after her son.
His company made a great deal of money off Barbie dolls that looked like celebrities such as Jennifer Lopez.