That link isn't working for me. But
here's the actual letter. Quite a few retired tech people in there (some whose companies are defunct or have fallen from "heaven"), and not a lot of people from current tech high-flyers. Several names popped out at me:
"Rev. Jesse L. Jackson Sr., President and Founder, Rainbow PUSH Coalition"
"Mark Lloyd, Professor of Communication, University of Southern California — Annenberg School"
"Alex Nogales, President/CEO, National Hispanic Media Coalition"
"Alec Ross, Author, The Industries of the Future"
"Steve Smith, Executive Director, Public Policy Institute, Government Relations & Telecommunications Project, Rainbow PUSH Coalition"
These are not entrepreneurs. These people listed above are mostly activists, plus a stray pundit and a university professor whose specialty is not tech or entrepreneurship.