I've seen a ton of MIT president L. Rafael Reif associated with Stephen Heymann and it's starting to grate on my nerves. Here is a 2011 cyber crimes symposium that shows him.
http://www.nelfonline.org/cases/NELF2011YearInReview.pdfPanelist description for him is -
Stephen P. Heymann, Esquire, Chief of the Cybercrimes Unit in the U.S. Attorneys Office for the District of Massachusetts
Thus I'm pretty certain this was the lead prosecutor against Aaron Swartz. I just find it amazing that a "public servant" would have so little publically available.