WISHING ALL GRADUATES EVERYWHERE
The choice of a commencement speaker in American Universities is based quite frequently on worldly accomplishments, rather than being based solely on formal, university-centric, accomplishments. It is as it should be: Even the purpose of formal education is to assist the graduates in helping the world along anyway.
Years ago, we heard Steve Jobs giving a moving commencement speech for Stanford students in 2005. The latest example in 2012: Nipun Mehta, Founder Of Service Space, Delivers Inspiring Graduation Speech To Students At The University Of Pennsylvania. Neither of these have earned PhDs, but both have exhibited a lot of unconventional thinking.