There is very little known about Peter Serafinowicz, the actor providing the voice of Darth Maul.  The only facts known about the man who helps give Maul his mysterious aura is that he is currently living in London, where he does voice overs for commercials, animated films, and a few miscellaneous acting roles.  Also, in April of 1999 he guest starred on the British television show "Murder Most Horrid", playing "Tony" in the episode "Dinner at Tiffany's."

Empire magazine has an interview with Peter

Filmography: Star Wars: Episode I - The Phantom Menace (1999) (voice) - Darth Maul You Are Here: Whatever Happened to Baby Jo? (1998) (TV Movie) - Dr. Phil Phillips "How Do You Want Me?" (1998) TV Series - Dean Yardley "Comedy Nation" (1998) TV Series - Various roles Jack and the Beanstalk (1998) (TV Movie) - Second henchman Doppelganger (1997) (voice) - Unknown

"Darth Maul" sells American Express (and more)
"Darth Maul" impersonates old Obi-Wan Kenobi (and more)

Thanks to AmidalaEp1 for the research. It's amazing what that gal can discover on the net!

And thanks to Ali for the picture