在Harry Gregson-Williams事业的早期，20世纪80年代，他作为一名音乐教师在Hindhead的学校里授课（他的兄弟Rupert Gregson-Williams，也是一名电影作曲家，在这个期间也在这所学校授课）。之后在他曾经学习的Guildhall学校教授音乐和戏曲。目前活跃在电影及游戏配乐领域中。 Harry Gregson-Williams的配有恢宏大气，最近的游戏《使命召唤4》和《合金装备4》的游戏原声音乐都是有他创作的，其中的Old Snake ,metal gear saga,father & son都是不可多得的好曲子.Early in his career, Harry Gregson-Williams held a position in the 1980s as a music teacher to pupils at the Amesbury School in Hindhead, Surrey, England (his brother Rupert Gregson-Williams, also a film composer, also taught at Amesbury School during this period).He later taught music at the Guildhall School of Music & Drama, where he had been a pupil, and also for a short period in both Egypt and Africa.In addition to scoring a number of motion pictures including Kingdom of Heaven, The Chronicles of Narnia: The Lion, the Witch and the Wardrobe, "The Forbidden Kingdom",Sinbad: Legend of the Seven Seas, The Rock, Shrek, Chicken Run, Antz, Spy Game, Man on Fire, Domino, and Team America: World Police, Gregson-Williams has also worked on the video games Metal Gear Solid 2: Sons of Liberty, Metal Gear Solid 3: Snake Eater, and Metal Gear Solid 4: Guns of the Patriots. His arrangement of the original Metal Gear Solid Main Theme was one of many works he created for the Metal Gear Solid productions that involved both orchestral and electronic textures.In his score to the Ridley Scott film Kingdom of Heaven, he introduced a mix of operatic and Middle Eastern themes. One track, Ibelin, was reprised as the closing credits theme with singer Natacha Atlas performing Arabic lyrics.He scored The Chronicles of Narnia: The Lion, the Witch and the Wardrobe, as well as the second installment in the series, The Chronicles of Narnia: Prince Caspian. (David Arnold is under contract for The Voyage of the Dawn Treader.) He also will compose the next film in the X-Men film series, X-Men Origins: Wolverine.Harry has also worked with the electronic music group Hybrid. In 2004, he produced a track called The Drop (Man On Fire Edit) for Hybrid Present Y4K. He and Kirsty Hawkshaw worked with Hybrid on their 2006 album, I Choose Noise.His studio is called Wavecrest Music. Gregson-Williams was a member of Hans Zimmer's Remote Control Productions (formerly known as Media Ventures) along with John Powell, Klaus Badelt, and Mark Mancina.