|Title||Consulting producer, Writer|
|Date of birth||26 March 1956|
Mark's past work includes writing the movie My Name Is Bruce, starring Bruce Campbell, acting as writer and co-executive producer on the television series Battlestar Galactica, writer/producer on the first three seasons of Smallville, and screenwriter on the movies Timecop and The Mask. Mark has also written nearly 125 comic books including The American, Aliens, Predator, The Phantom, Superman and Superman/Batman. Currently, he is also writing the screenplay for the original feature film ARK from Sony Pictures, produced by Neal Moritz and Mike Richardson, and the live action adventure Quatermain at DreamWorks Pictures. In 2011, Mark began working with Greg Beeman as co-executive producer of Falling Skies for TNT, along with executive producer Steven Spielberg.
- Dr. Gibson says that she took over for Dr. Verheiden (Hysterical Blindness). This unseen character is named after Mark Verheiden.