Robi is a Mexican-American musical theatre writer and performer living in Philadelphia. Shortly after moving to the US from Mexico City at the age of fourteen, his passion for the arts grew rapidly and developed into a career choice. He appeared on Broadway in the 2006 Tony Award-winning musical Spring Awakening, as well as How To Succeed in Business Without Really Trying, Bye Bye Birdie, and Doctor Zhivago. He toured the country with the 2015 Tony Award-winning musical Fun Home and Spring Awakening. Regionally he appeared at Arden Theatre Company in Ragtime, Next To Normal, Parade, and Fun Home. He played the role of Clyde Barrow in Bonnie & Clyde at Theatre Under the Stars.
As a composer, he wrote songs “Quiero Soñar" and “Maduros” along with friend Alex McCabe which appeared in films Top Five and Can You Ever Forgive Me?. His solo concert Robi Hager: So Far was part of the Arden’s 2021 virtual season which featured his musical compositions, so far.
His musical Little Duende was one of two musicals accepted for the 2021 NMTC at The O'Neill Center and was also featured as one of eight musicals in the 2021 NAMT festival in NYC. Robi returned to The O'Neill Center the following year for their 2022 NMTC, this time with his other musical Siluetas, inspired by the art of Ana Mendieta. Siluetas is receiving a full production May 2024 and is produced by Power Street Theatre Company in Philadelphia.
Robi is the composer and producer of LGBTQ musical Basic Witches, which earned him a 2018 Barrymore Award nomination for best original score. He's also been commissioned by the Arden Theatre Company to write a new children's musical based on the legends of King Arthur.