Chris Visser was involved in starting up the SAGA mailing list and the SAGACouncil mailing list, and I believe he served on the SAGA Council at one point. He represented South Africa at the World Amateur Go Championship in 1997, and won the SA Open African Players title in 1999. Chris was instrumental in bringing Aketa Katsuyuki to visit South Africa in 2005/2006, after meeting him during some time in Mongolia.
Chris lives in a number of countries, travelling between them regularly. Among these countries are South Africa, Australia, and (I think) Singapore.
Here's a link to his entry in the European Go Database.