Parks began his professional career as an inker in comic books with Dark Horse Comics. He has inked the penciled artwork of such titles as Wonder Woman, Catwoman, Superman, Daredevil and Spider-Man. His artistic style has won him praise in the comic books industry, including an industry Harvey nomination as best inker. His idols and influences include Neal Adams, Frank Miller, Jack Kirby, and Dick Giordano. Parks has stated in at least one on-line interview that he inks with Hunt 102 and Brause 511 pens and a Raphael #3 brush. For characters from the comic books, Parks has acknowledged he has most enjoyed Batman and Captain America as his favorite characters.