MacRetreats today announced the keynote speakers for the first Mac Networkers Retreat, a 3-day gathering of Mac Networking and IT professionals to be held July 7-9 on the campus of the University of California at Santa Barbara. Opening the event will be Tom Yager, Test Center Director and Columnist for InfoWorld. Also keynoting will be Alan Oppenheimer, president of Open Door Networks and one of the original architects of the Mac’s networking capabilities.