With a diverse repertoire of over sixty operas and a broad spectrum of orchestral and choral works, Joshua has recently held positions as a conductor/coach/chorus master on the music staff of the St. Louis Symphony Orchestra, Austin Opera, Detroit Opera, Florida Grand Opera, North Carolina Opera, Opera Saratoga, Pensacola Opera, Fort Worth Opera, the Boulder Philharmonic Orchestra, and the Colorado Music Festival. Joshua’s guest and workshop conducting includes work with the Baltimore Symphony Orchestra, the Omaha Symphony, the Oregon Bach Festival Orchestra and Chorus, the Cabrillo Festival Orchestra, the Bohuslav Martinu Philharmonic Orchestra, Orquestra Filharmonia de Chihuahua, the Lyatoshinsky Chamber Orchestra, the Newport Music Festival, the Colorado New Music Ensemble, the PENDULUM New Music Ensemble, the Boston Opera Collaborative, and the Boulder Bach Festival.

As a dedicated interpreter of new works, Joshua has enjoyed frequent collaborations with many of today’s leading composers including Tom Cipullo, Jennifer Higdon, Libby Larsen, Evan Mack, Ricky Ian Gordon, Evan Snyder, Scott Eyerly, and Paul Fowler. At Opera Las Vegas, Joshua has been instrumental in the development of their award-winning Living Composers and Librettists initiative, which has been selected for four consecutive NEA awards. For two seasons, Joshua served as Music Director/Conductor of the CU New Opera Workshop where he collaborated with composers Libby Larsen and Alberto Caruso as well as author Colm Tóibín and stage director Ron Daniels. For four seasons, Joshua served as conductor/co-founder of the Colorado New Music Ensemble where he programmed and conducted works ranging from John Corigliano’s Symphony No. 2 to Susan Botti’s chamber opera Telaio: Desdemona. While a Festival Artist/Conductor at the Newport Music Festival, Joshua conducted members of the Rhode Island Philharmonic and Providence Singers in a series of contemporary choral/orchestral masterworks.