Hirono Oka teaches individual lessons on violin by special arrangement at Temple Music Prep, and serves as adjunct violin faculty at the Boyer College. Oka has attended the Toho Conservatory of Music (Tokyo), San Francisco Conservatory, and the Curtis Institute of Music. Past teachers include Ivan Galamian, Jaime Laredo, Arnold Steinhardt, Felix Galimir, and Stuart Canin. 

Oka has appeared as a soloist with the San Francisco Chamber Ensemble and Utica Symphony, as a chamber musician at the Marlboro Music Festival, Chamber Music West, Theatre Chamber Players of the Kennedy Center, Network for New Music, Delaware Chamber Music Festival, and Philadelphia Chamber Music Society. Oka has toured with the Brandenburg Ensemble and Music from Marlboro.

Hirono Oka is a member of The Philadelphia Orchestra.