Bill Kules, The Catholic University of America, USA
Dr. Kules is an Assistant Professor in the School of Library and Information Science at the Catholic University of America. His research interests include the design and evaluation of rich information interfaces to support complex information seeking tasks like exploratory search. He was the Program Chair for HCIR 2008, an organizer of the 2005 Workshop on Exploratory Search Interfaces and a guest editor for the April 2006 CACM special section, "Supporting Exploratory Search."

Daniel Tunkelang, Endeca, USA
Dr. Tunkelang is co-founder and Chief Scientist at Endeca, a provider of enterprise information access solutions. He leads Endeca's efforts to develop information retrieval capabilities that emphasize interaction. Daniel spearheaded the first HCIR workshop in 2007, is organizing the SIGIR 2009 Industry Track, and is about to publish the first book on faceted search. His blog, The Noisy Channel (http://thenoisychannel.com), is the leading online forum devoted to HCIR.

Ryen White, Microsoft Research, USA
Dr. White is a Researcher in the Text Mining, Search, and Navigation Group at Microsoft Research, Redmond. His research interests include exploratory search, implicit relevance feedback, query expansion, log analysis, and the evaluation of search systems with humans and simulations. Ryen has authored over 80 conference and journal publications in these areas, received three "best paper" awards, and the British Computer Society's Distinguished Dissertation Award for the best Computer Science Ph.D. in the United Kingdom in 2005.