Stanford's 2015 Commencement speaker is journalist -- and Stanford alumnus -- Richard Engel. You can read about him and about Commencement Weekend both in this article from the Stanford Report and on the 2015 Commencement website. Commencement will take place in the Stanford Stadium on Sunday, June 14.
Richard Engel graduated from Stanford in 1996 with a BA in International Relations; he is currently the chief foreign correspondent for NBC News. You can check the SearchWorks catalog for titles by Engel available in the libraries. You can also view further biographical information about Richard Engel in the Biography in Context database.