Featured performances at festivals and venues include Festival de Musica Contemporanea de La Habana in Cuba, Nuova Consonanza Festival in Rome, Kimmel Center Philadelphia, Lagonegra International Guitar Festival, EMPAC Filament Festival, Philadelphia Museum of Art, Shanghai Conservatory of Music, New York Guitar Festival, Società del Quartteto di Vercelli, TEDx Phoenixville, and an all-Stiefel concert for the Yale Guitar Extravaganza.
Stiefel’s music has been supported by the Augustine Foundation, the Georgia Council for the Arts, Mid-Atlantic Arts Council, Met-Life Composer Connections, and the American Composers' Forum.
An active private teacher of composition and guitar, Stiefel has started writing about music on Substack. He has been on the faculties of the Princeton University Writing Center, McGill University, and West Chester University of Pennsylvania.