Pak was born in Dallas, Texas, and graduated from Hillcrest High School. He studied political science at Yale University, where he wrote for the campus humor magazine, The Yale Record, and was a member of the Purple Crayon improvisational group. In 1991 he went to study history at Oxford as a Rhodes Scholar with the intent of becoming a politician. He then entered New York University’s graduate film program.
His New York University (NYU) student film, Fighting Grandpa, about his Korean grandparents, won the Gold Medal at the 25th Student Academy Awards. His short film “Asian Pride Porn”, starring playwright David Henry Hwang and director Michael Kang, was licensed to Atom Films. Pak’s feature film Robot Stories won 35 film festival awards. He collected his critically acclaimed screenplays in the recent book Robot Stories & More Screenplays, whose foreword was written by David Henry Hwang, and which has been used in college classes in writing, film, and Asian American studies.
Pak frequently writes for Marvel Comics, starting in September 2004 and signing an exclusive deal with them in July 2005. He has worked on such titles as Warlock, Phoenix: Endsong, Phoenix: Warsong, Iron Man, The Incredible Hulk, and Dynamite Entertainment’s spin-off series based on the Sci-Fi Channel’s Battlestar Galactica.
2000s projects include Incredible Hercules, World War Hulk: Warbound and Skaar: Son of Hulk, all spinning-off from World War Hulk, as well as Magneto: Testament and War Machine. Pak is one of the featured contributors to Secret Identities: The Asian American Superhero Anthology.
In June 2013, Pak began writing Batman/Superman for DC Comics. In November 2013, he began writing Action Comics with issue number 25.