Cassidy is currently starring as the lead role of Carole King in BEAUTIFUL, the smash hit musical about the singer-songwriter's life, to rave reviews.

She also recently appeared as Ruth in DESSA ROSE at the Trafalgar Studios for which she was nominated for a Broadway World award for Best Actress.

She appeared in the Menier Chocolate Factory's revival of CANDIDE in the role of Paquette and in the principle role of Maggie in the original West End cast of LEND ME A TENOR at the Gielgud Theatre. Prior to that she played Amy in Stephen Sondheim's COMPANY at the Southwark Playhouse and lead role of Kate Monster and Lucy the Slut in AVENUE Q. She was in the original London cast of WICKED and played standby Elphaba.

She took part in the BRIDGET JONES: THE MUSICAL workshops directed by Stephen Daldry, and in the role of Myrna in the workshop for a new musical MISS ATOMIC BOMB.

Recent feature film credits include THE HIKE.