Murray Gold
Murray Gold is the composer for the revived series of Doctor Who.
Among his duties was composing new arrangements of the Doctor Who theme. To date he was arranged several different versions of the theme for broadcast (including two distinct opening theme arrangements, plus another version that was only used in trailers and promotions in 2005), and several more for live performance. Gold has therefore created more official arrangements of the theme than any other Doctor Who franchise composer.
Gold has also composed all the incidental music for Doctor Who since 2005, as well as major work on music for Torchwood and The Sarah Jane Adventures (including the themes for both series). He has also written five songs for the series: "Song For Ten" (The Christmas Invasion), "Love Don't Roam" (The Runaway Bride), "My Angel Put the Devil in Me" (Daleks in Manhattan), "The Stowaway" (Voyage of the Damned) and "Song of Freedom" (Planet of the Ood and Journey's End). Three soundtracks for Doctor Who featuring his music and songs have been released to date, and he also has contributed to the two volumes of Torchwood soundtracks (mostly via his theme).
Murray Gold also appeared, in a cameo role, as a guitarist in Voyage of the Damned.
He was interviewed about his DW music by "Sound On Sound" magazine in the June 2007 issue. (See [1])
As of September 2009 it has not yet been announced officially whether Gold will continue as house composer for Doctor Who under the new production regime. If so, it's likely he will, once again, be asked to compose a new arrangement of the Doctor Who theme.