BZFX was started in early-2006 by A Meteorite. The exact date when BZFX started hosting servers is unknown, but the BZFX domain was registered May 29, 2006 which makes it the official birthday of BZFX.
To contact BZFX directly, you should go to the #bzfx channel on IRC Freenode.
If you wish to contact a BZFX administrator to resolve any issues, contact that administrator first. Issues can almost always be resolved, but if it can not be, BZFX's owner, A Meteorite, will be contacted. If you need to contact A Meteorite for a reason other than administration issues, see his user page.