F. Randall "Randy" Farmer has been creating online community systems for over 30 years, and has co-invented many of the basic structures for both virtual worlds and social software. His accomplishments include numerous industry firsts (such as the first virtual world, the first avatars, and the first online marketplace). Randy worked as the community strategic analyst for Yahoo!, advising Yahoo properties on construction of their online communities. Randy was the principal designer of Yahoo's global reputation platform and the reputation models that were deployed on it. Bryce Glass is a Sr. Interaction Designer at Yahoo! Inc, and has worked on Internet community products and platforms for most of the past 10 years, with some of the Internet's best-known brands (Netscape, America Online and Yahoo!). Bryce was the User Experience lead for Yahoo's Reputation Platform and consulted with designers and product managers on a number of properties (Yahoo! Buzz, Yahoo! Answers and Message Boards, amongst others) that employed it. Bryce distilled the research and best practices from those engagements into a series of User Experience Patterns for Reputation that have garnered much attention in the social software design world. Bryce is also recognized for his work on visualizing complex ideas in a straight-forward and approachable fashion. His diagram, Flickr User Model, has been featured in numerous information visualization blogs and was included in Dan Brown's Communicating Design. He looks forward to the challenge of illustrating a deep and detailed model for Reputation Systems in his book Building Web Reputation Systems.