A member of the CSO since 1997, Thomas also is assistant principal cellist of The Santa Fe Opera orchestra. For seven seasons he served as Principal Cellist of the Grand Teton Music Festival orchestra. In 1990, Thomas performed as assistant principal cellist under Leonard Bernstein at the Pacific Music Festival. He has performed at the Strings in the Mountains (Steamboat), Chintimini, Wintergreen (VA), Bravo! Vail, June in Buffalo, and Bellingham music festivals.

Thomas has collaborated with Ida Kavafian, David Krakauer, Elmar Oliveira, Todd Phillips, and William Wolfram and worked with composers Fred Bretschger, Jon Deak, Phillip Glass, Luis Jorge Gonzalez, Pierre Jalbert, David Mullikin, Clark W. Ross, and R. Murray Schafer. He is a founding member of the Boulder Piano Quartet, former ensemble-in-residence at the Boulder Public Library, and the Denali Ensemble. Thomas’ performances have been broadcast across North America on CBC Radio's Chamber Music at Noon, NPR's Performance Today, and CPR’s Colorado Spotlight. He has recorded for the Summit, Koch, Meridian, and EMF labels.

Thomas has served on the faculties of Memorial University of Newfoundland and the University of Colorado at Boulder. His principal mentors and teachers include Leopold Teraspulsky, Alan Harris, and Aldo Parisot.

An intermittently intense and obsessive birder, Thomas has seen over 350 species of birds in Colorado, 600 species in North America, and over 1000 worldwide. Over the last several years, he has become active in bird photography. Thomas’ photos have been published in several birding journals and newsletters as well as the Raptor Guide of Southern Africa. He displays his photos in web galleries at www.pbase.com/birdercellist. Also interested in mountain biking, backpacking, mountaineering, and rock climbing, Thomas has hiked and climbed over 25 of Colorado’s 14ers, the Grand Teton, Mt. Kilimanjaro, and many mountains in the north Cascades.

Thomas lives in Boulder with his wife, violinist Beth Kipper, and their children Eli and Emi.