Other collaborations included a novel with Lester Del Rey, "Preferred Risk" (1955). This novel was solicited for a contest by Galaxy–Simon & Schuster when the judges did not think any of the contest submissions was good enough to win their contest. It was published under the joint pseudonym Edson McCann. He also collaborated with Thomas T. Thomas on a sequel to his award-winning novel "Man Plus." He wrote two short stories with Isaac Asimov in the 1940s, both published in 1950.