Harrison is a creative who works in a number of different roles within theatre. As a casting associate/consultant his credits include Bring It On (Southbank Centre and UK Tour, 2021), Legally Blonde (Regents Open Air Theatre, 2022). Harrison also works as a musical director, having recently musically directed a new musical audiobook for Audible.
Harrison is the founder and Artistic director of True Voices Company. A company dedicated to the promotion and representation of trans, non binary, queer and other marginalised performers, particularly within musical theatre. TVC is resident theatre company at both The Turbine and The Other Palace. Within this role Harrison also works as an equality and diversity consultant, specifically lecturing in drama schools.
As well as this, Harrison is a writer working with his writing partner Misia Butler. They have a TV series currently in development and have been commissioned to write a radio play for BBC R4 for broadcast in July 2023. They both are dramaturgs and consultants for the new musical adaptation of The Danish Girl,written by Alex Parker and Katie Lam, which is in development.