 In the 1970s, he operated phony mail-order colleges, including the Colorado State Christian College and Hamilton State University, and he was also involved in a company marketing a device fraudulently claimed to increase gas mileage.He died in Reno, Nevada.Ozaki was the author of approximately two dozen popular mid-20th century detective novels under both his given name and the pseudonym Robert O. Saber, and was one of the first American mystery writers of Japanese descent.