Guillaume Dumas attended college at some of the best universities in the world but he was not like the other students attending the classes. He attended without being enrolled or receiving a degree.

Fast Company reports.

Ivy League For Free: What One Man Learned By Crashing Elite Colleges for 4 Years

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. He then went on to start a successful online dating business in Montreal.

For four years, the 28-year-old from Quebec lived the life of a wandering scholar, moving from one university town to the next, attending lectures and seminars, getting into heated debates with professors. Sometimes he was open about his unregistered status, but most of the time, fearing reprisal, he kept it quiet. To pay for his everyday expenses, he worked at cafes and occasionally earned money by writing papers for other students. He lived at co-ops or other cheap student housing, but at Brown, when funds got particularly low, a kind soul let him set up his sleeping bag and tent on the roof. At the end of all this, he never received a degree.