We got the following in:

I thought you might be interested in posting information about the Sword Spectacular Weekend in Los Angeles June 18-20th, where Bob Anderson, creator of the original light sabre fight and the man in the Darth Vader suit fighting with Obi Wan, will be giving some talks and demonstrations. Further information is available at http://members.aol.com/SSWebpage/main.html This will be a rare opprtunity to meet and talk to the legendary Mr. Anderson, whose public appearances are few and far between! If you have any questions, please contact mary@delongis.com.

I believe it was Prowse that fought with Obi-Wan, but Bob Anderson was definitely doing a lot of the stunt work in ESB.