He entered the industry in 1987 as an artist for Marvel Comics, illustrating titles such as Alpha Flight and The Punisher War Journal, before gaining popularity on The Uncanny X-Men. X-Men #1, the 1991 spin-off series premiere that Lee penciled and co-wrote with Chris Claremont, remains the best-selling comic book of all time, according to Guinness World Records. His style was later used for the designs of X-Men: The Animated Series.[1] In the year 1992, Lee and several other artists formed their own publishing company, Image Comics, to publish their creator-owned titles, with Lee publishing titles such as WildC.A.T.s and Gen¹³ through his studio WildStorm Productions. In February 2020, Lee became the sole Publisher of DC Comics. Since June 2018, he has also been the Chief Creative Officer (CCO) of DC Comics, replacing Geoff Johns.