Another key contributor during the first 15 years of "MR" was economist Paul Baran, frequently considered as the third member of an editorial troika including Sweezy and Huberman. A tenured professor at Stanford University, Baran was one of a very few self-identified Marxists to teach economics at American universities during the Cold War period. Baran worked closely with Sweezy on a book regarded as a landmark in Marxist theory entitled "Monopoly Capital," although he died of a heart attack prior to the work's first publication in 1966.