Since his 2009 Philadelphia Orchestra debut, praised by the American Record Guide as a performance of “precision and rapturous immediacy,” Gregory Walker has gained international recognition for his "beautifully calibrated phrasing," “ravishingly beautiful” tone, and the “sheer virtuoso force”of his delivery. While developing unique collaborations with the Poland's SinfoniaVarsovia, Filharmonia Sudecka and the Encuentro Musical de los Americas in Havana, Cuba, as well as the Detroit Symphony, Colorado Symphony, Cleveland Chamber Symphony, Breckenridge Festival Orchestra, the Oberlin Conservatory Orchestra, Ft. Collins Symphony, Yaquina Chamber Orchestra, the Colorado Music Festival Orchestra, and the Bavarian Youth Orchestra in Germany, he has been engaged at Norway's Tromsø Cathedral Series, the Gateways Music Festival in Rochester, New York, the Centro Mexicano para la Musica y las Artes Sonoras, Cork Orchestral Society Concert Series in Ireland, and at the U.S. Library of Congress.
Profiled in the internationally-distributed 2012 Chuck Fryberger documentary, Song of the Untouchable, Walker's discography includes critically-acclaimed releases from the Newport Classic, CRI, Orion, Centaur, and Leonarda record labels. He has performed with pop star Lyle Lovett and, as past concertmaster of the Boulder Philharmonic Orchestra, appeared with Mstislav Rostropovich and Itzhak Perlman, as well as Doc Severinsen and the Marcus Roberts Trio. Walker has been featured on National Public Radio, in Strings magazine, and on the cover of the April 2007 International Musician. He can be heard on Albany Records' 2014 recording of Pulitzer Prize-winning composer George Walker’s Violin Sonata No. 2.