Pak worked as the cinematographer on the 1998 documentary short The Personals: Improvisations on Romance in the Golden Years, which was directed by his wife, Keiko Ibi.

[7] Pak began writing for Marvel Comics in September 2004, with a 4 issue Warlock series,[8] and signed an exclusive deal with them in July 2005.

Pak returned for a solo Hercules comic some months later, initially tying into the Thor-centric Fear Itself series, which ended in early 2012.

[17][18][19] At the same time as his Planet / World War Hulk run, Pak also wrote Dynamite Entertainment's initial series based on the Sci-Fi Channel's Battlestar Galactica.

[23] In 2019 Pak would help bring the characters Aero and Sword Master into the Marvel Universe proper, initially created in Chinese digital comics the previous year.

Pak also wrote a new series of Agents of Atlas comics, which would feature Aero and Sword-Master interacting with other young Marvel heroes, including Wave, White Fox and Amadeus Cho.

In 2023 Pak wrote an educational comic book entitled Who Belongs?, drawn by Jeremy Arambulo, colored by Irma Kniivila, and lettered by Janice Chiang.