Boleslav William Felix Robert "Bill" Sienkiewicz (born May 3, 1958) is an Eisner Award-winning American artist and writer best known for his comic book work, primarily for Marvel Comics' The New Mutants and Elektra: Assassin. Sienkiewicz often utilizes oil painting, collage, mimeograph and other forms generally uncommon in comic books.Sienkiewicz was born May 3, 1958, in Blakely, Pennsylvania. When he was five years old, he moved with his family to Hainesville, New Jersey, where he attended elementary and secondary school.
Sienkiewicz began drawing "when [he] was about four or five", and continued doing and learning about art throughout his childhood. His early comic-book influences include artist Curt Swan Superman comics, and artist Jack Kirby's Fantastic Four.
Sienkiewicz attended the Newark School of Fine and Industrial Arts in Newark, New Jersey.