[1] He worked with Marv Wolfman and Pérez on the "A Lonely Place of Dying" storyline which introduced Tim Drake as the new Robin.

[4] Grummett drew part of The Adventures of Superman #480 (July 1991) and became the main artist on that series with the following issue[1] and then worked on the "Panic in the Sky" crossover in 1992.

[10] Other work for DC included collaborating with Chuck Dixon on a Secret Six one-shot (Dec. 1997) as part of the Tangent Comics imprint[11] and co-creating the Power Company series with writer Kurt Busiek in 2002.

Along with the other Gorilla Comics creators, Kesel and Grummett attempted to continue the series they started, but these efforts proved to be unsuccessful.

[18][19] At Marvel Comics, he completed a run as penciller on Thunderbolts, with writer Fabian Nicieza and inker Gary Erskine in 2007[1] and in 2009 he co-created the X-Men Forever series with Chris Claremont.