Stewart was born in London, England and having trained as an Actor Teacher worked in Repertory Theatre. In 1980 his practice as a Voice Coach began, teaching under the auspices of Cicely Berry at the ‘Guildhall School of Music & Drama’, and in 1981 Stewart became the Head of Voice at the prestigious ‘Webber Douglas Academy of Dramatic Art’, continuing until 1997. During this period he also worked pervasively throughout the theatre industry at the ‘Actors Centre’, and in the West End and as a coach with many major companies such as the ‘Actors Touring Company’.

From 1997-2010 Stewart was the Master of Voice at ‘Shakespeare’s Globe Theatre’ for Mark Rylance, the first Artistic Director of the newly reconstructed Theatre.

Stewart regularly coaches premier theatre companies such as ‘Classic Stage Ireland’, ‘Chicago Shakespeare Theater’ and has coached the ‘Long Wharf Theater Connecticut’, The Royal Court Theatre, and Sonia Friedman Productions in the West End.

Clients have included luminaries of the entertainment industry such as Maria Aitken, Frances Barber, Minnie Driver, Kathryn Hunter, Vanessa Redgrave, Janet MacTeer, Jonathan Cake, Simon Callow, Hugh Bonneville, Matthew Goode, Eddie Redmayne, Mark Rylance and Sebastian Stan.

In addition, Stewart has been coach to many eminent personalities such as Diana Princess of Wales, Dame Anita Roddick, Margaret Thatcher, and the LONDON 2012 OLYMPIC BID. Currently he works through the international corporate market, dealing with many aspects of the presentation process including authentic communication, presence & vocal gravitas and persuasive presentation. Having experienced leading empowerment models, such as NLP, Stewart brings creative self-development issues to the arena of personal presentation.

Clients have included: Allen & Overy, L`Oreal, BT, BBC, ITN World News, McKinsey & Co, Merrill Lynch, WPP Programs, Momentum PR Dubai, Vidal Sassoon, Redken and McKenzie Boston.

Stewart’s seminal text ‘The Alchemy of Voice’ was published in 2005, republished by Findhorn Press in 2010, and he regularly appears in the media addressing the issues of Voice and Persona as powerful expressions of human integrity.