Bill Sienkiewicz, born May 3, 1958 in Blakely, Pennsylvania, USA, is one of the recurring artists on IDW's TMNT Universe.

He has worked on Action Comics, JLA, The Titians, Aquaman, Superman, Birds of Prey, Green Arrow/Black Cannery, Kamandi Challenge, Spider-Girl, Daredevil, Defenders, Swamp Thing, Black Widow, Raven: Daughter of Darkness, Fantastic Four, Survivor's Club, Savage Dragon and Marvel's Star Wars.

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