Simon Gilbert (born 6 October 1937 in Hendon, London) is an English actor and tenor.
At the age of twenty one he took singing lessons with the teachers of the Australian soprano Joan Sutherland.
Gilbert gradually gravitated towards Opera and The Edinburgh Festival, where sang with Sutherland (in Haydn’s Orfeo) and Luciano Pavarotti (in I Capuleti e i Montecchi).
[6] Gilbert was dubbed by at least one journalist the 'Marni Nixon' of 'La Mancha' on this account,[7] and O'Toole's lip-synching was deemed good enough 'to have fooled... many of the critics' of the time.
[7] The next year he appeared alongside Ginger Rogers, in a production of Jerry Herman's Mame at The Drury Lane Theatre, as lead understudy, for a number of performances.