Stanford's 2014 Commencement speakers are philanthropists Bill and Melinda Gates. You can read about them and about Commencement Weekend both in this article from the Stanford Report and on the 2014 Commencement website. Commencement will take place in the Stanford Stadium on Sunday, June 15.
Take a look at SearchWorks for titles by Bill Gates and by the Bill and Melinda Gates Foundation available in the libraries. You can also view biographical information about Bill Gates and Melinda Gates in the Biography in Context database.