Mason recently starred as The Emcee in the current West End revival of Cabaret, and can be seen as Dr. Ian Wright in NBC's Quantum Leap sequel series, Gren in the Netflix live action adaptation of Cowboy Bebop, Desire in Neil Gaiman's The Sandman, and in Amazon's Critical Role: The Legend of Vox Machina. Best known for playing the titular role in the Broadway National Tour of Hedwig and the Angry Inch, they can also be found in the films National Anthem, Before You Know It,  and such TV shows as Broadway or Bust and Becoming and Artist on PBS, or iCarly and Bucket and Skinner's Epic Adventures on Nickelodeon.  They recently earned a Helen Hayes Award for Best Leading Performer in a Musical, and starred in the Pulitzer Prize winning play I Am My Own Wife at the Long Wharf Theatre January-March 2020.