Giles has led the text work at Shakespeare’s Globe since 1999, and to date has been involved in over 100 productions. Directing work for Shakespeare’s Globe includes: Antony and Cleopatra, Hamlet and Troilus and Cressida.

Posts include: Associate Director at Ipswich Theatre (1974 – 77), Staff Director at The National Theatre (1977 – 81) and Director of Platforms at The National Theatre (1981 – 84).

Other theatre direction includes: The Fawn, She Stoops to Conquer (National Theatre); Macbeth, The Cherry Orchard, King Lear, Richard III, Hamlet, Skylight and Vincent in Brixton (Shochiku Company, Japan). In 2000 the Association of Major Theatres of Japan recognised Giles for services to the Japanese Theatre. In recent years, Giles has directed The Tempest, Henry V and The Comedy of Errors at The Blackfriars Theatre in Virginia.

Giles is the author of Speaking the Speech – An Actor’s Guide to Shakespeare. In 2011, Giles, together with Glynn MacDonald, was given the Sam Wanamaker Award for services to the Globe.