Guillaume Dumas attended the most expensive schools on zero tuition. He discovered what a college degree can—and cannot—get you in life. Guillaume DumasPhoto: Radio-Canada/ Olivier Lalande Between 2008 and 2012, Guillaume Dumas took courses at some of the best colleges in North America—Stanford, Yale, Brown, University of California Berkeley, McGill, and University of British Columbia, among others—without being enrolled as a student.