Austin performs regularly as a member of saxophonist, Jerry Bergonzi’s Quartet and has recently performed and/or recorded with George Garzone, Joe Lovano, Ben Monder, Lionel Loueke, Lage Lund, Kate McGarry and Grace Kelly. He has also appeared as an opening act for Grammy award-winners Dianne Reeves and Esperanza Spalding.

On tour, Austin has performed at:
- Carnegie Hall
- The Kennedy Center
- Earshot Jazz Festival
- Aspen Music Festival
- Discover Jazz Festival
- Cape Cod Jazz Festival
- Bar Harbor Jazz Festival
- Lake George Jazz Festival
- Young Jazz in Town Festival (Foligno, Italy)
- Casa de Teatro Jazz Festival (Dominican Republic)
- Ballydehob International Jazz Festival (Cork, Ireland),

as well as performing at jazz clubs, concert halls and theaters throughout New England, the US, Italy, Germany, Finland, and France.

McMahon is the winner of the 9th annual Independent Music Awards for Jazz SongCategory and Nominee for Best Jazz Album in the 11th annual IMA's. His debut CD Many Muses was selected as a CDBaby Editor’s pick and described as "subtle, reverential to tradition, and thoroughly new." He was recently featured on NPR JazzSet with Dee Dee Bridgewater, WLRN Miami (NPR station) and live on WGBH radio, Boston, MA.

Austin currently teaches in the Jazz Department at New England Conservatory Preparatory and Continuing Education Division, Boston, MA and has been a Teaching Fellow for Jazz Improvisation at Harvard University, Cambridge, MA since 2010. He has given masterclasses at Harvard University, University of Miami, University of Mainz (Germany) as well as numerous colleges and high schools throughout the US.

Austin McMahon is also the co-founder, producer and recording artist for the burgeoning record label Fractamodi ( and has recorded on over forty commercially released albums in the past several years.