Mientus toured the country in the hit Broadway musical Spring Awakening and most recently made his Off-Broadway debut in MCC Theater's production of Carrie. He also recently made his Broadway debut in the 2014 revival of Les Misérables as Marius. Other credits include: Mark Cohen in Rent, Februrary House at New York Stage and Film and several productions with the New York Musical Theatre Festival. He is currently developing the musical project Manhatten Kids with the band Teen Commandments.
He is openly bisexual, and married Michael Arden on August 18, 2016. Mientus is also a strong advocate for LGBT youth.
- Spring Awakening (2015, DWSA) - Hanschen
- Spring Awakening (1st National Tour)- Hanschen
- Rent - Mark Cohen
- February House
- Manhattan Kids
- Les Misérables (2014 Revival Cast) - Marius
- The Flash (2014-present) - Hartley Rathaway/Pied Piper
- Wicked - Boq