Drew W. Houston ’05, co-founder and CEO of Dropbox, the online file storage service, will be the keynote speaker for the graduating class of 2013 at MIT’s 147th Commencement on June 7, 2013. While Khan Academy founder and 2012 speaker Salman A. Khan ’98 was MIT’s youngest commencement speaker in at least 30 years, Houston is even younger at 29 years of age. He won’t be more than a couple of years older than many of the addressees receiving graduate degrees.