Where are the writers on the U.S. House of Reps hand-picked Copyright Principals Project?

On May 16th the House Judiciary Committee, Subcommittee on Courts, Intellectual Property, and the Internet held their first hearing on reform of the 1976 U.S. copyright law. The 5-member panel known as the Copyright Principals Project were the only witnesses. The five members are lawyers, professors and a Microsoft entry, all important voices, of course, but I will be following to see if other speakers are scheduled in the coming months.