 Before he became a freelance writer, Sumerak worked as an editor at Marvel Comics.His credits include work on "Avengers", "Thor", "Iron Man", "Fantastic Four", "Black Panther", "Captain Marvel", "Thunderbolts", "Hulk", "Sentinel", "Agent X" and many more.He was a member of the Marvel editorial team from 1999–2003, working alongside editor Tom Brevoort.