After the Second World War, he completed two internships with the Jewel Tea company in Chicago and the Alpha-Beta company in La Habra, California, before returning to Germany to study economics at the University of Hamburg. In the 1960s, he and his wife lived in Tacoma, Washington. He gave a big donation to the Tacoma Art Museum which led to more extensive Western Art ownership. At one time, he was the 6th richest man in the U.S., just one position ahead of Bill Gates, but later dropped to about 250th. Haub died at his home in Wyoming, USA.