As a collaborative artist, Kradjian has appeared in concert with violinists Ara Malikian (a fellow Lebanese-Armenian), Cho-Liang Lin, Lara St. John, Chee-Yun and Jonathan Crow, soprano Dawn Upshaw, baritone Russell Braun, tenor Michael Schade, violist Kim Kashkashian, percussionist Jamey Haddad, the Pacifica, New Orford, Cecilia String Quartets and Camerata Pacifica.

Hell’s Fury a theatre piece based on the “Hollywood Songbook” by German composer Hanns Eisler, a collaboration between Kradjian and baritone Russell Braun had its US premiere at Stanford University in 2019.

Kradjian is the artistic director and pianist of Canada’s acclaimed Juno winning Amici Chamber Ensemble,[3] responsible for innovative programming, promotion, and performance of 50+ concerts, including annual educational outreach program with the students of Claude Watson School for the Performing Arts at Earl Haig Secondary School in Toronto, Canada.

Kradjian's discography includes traversals of Franz Liszt's Transcendental Etudes and Piano Concerti on the Warner Music Spain label.

"Miniatures", an anthology of music written by Armenian composers, and Robert Schumann's three Sonatas for Violin and Piano (with Ara Malikian) are both Hänssler Classic releases.