He got a master's in 1949 at Northwestern. If he wrote a thesis for this degree, it doesn't seem to be available on the Internet.
As I recall, when McGovern left politics he decided to be a “consultant” — a paid lobbyist troublemaker. He was astounded by all the bureaucratic hurdles he faced and palms he had to grease to go into a new “business”. Never mind that many of these rules he helped create, but he never thought they applied (or should apply) to someone like him. Moron.