Grantley studied for a BA Hons degree in Music at Leeds University followed by a Post-Graduate diploma in Acting and Musical Theatre. He then toured Britain in several actor/musician shows both as a performer and musical

director before playing the role of Roger in the musical Grease in London's West End for two years.

Grantley then took the position of Head of Musical Theatre at the Urdang Academy of Performing Arts in Covent Garden and is currently Head of Musical Theatre at The Poor School of Acting, London.

During this time he has been musical director for various projects including Elegies for Angels, Punks and Raging Queens

and Godspell. Grantley has just finished a new production of Rent as Musical Director for The English Theatre in Frankfurt.