Rick Sapir is first and foremost an End-user Advocate not a hard-core programmer. He possess 15 years of experience in usability, documentation, and training (primarily with computer software, but other fields too). His primary contributions to the Tiki community are:
Monitoring the Forums and IRC channel, helping when I can.
Working on the Tiki Docs
Contribution useful plugins and mods, where I can. It has been a long time since he's done any real coding (does anyone still use Pascal and Fortran?),
You can read about some of his Tiki ideas modifications at Tiki blog.
Monitoring the TikiWiki feedback.
Working the Tiki Promo Squad to improve Tiki's pubic image (or lack-there-of)