Lost his picking hand in a train accident, leaving him with a hook instead. Greg continued to practice, and learned how to play his bass with his hook.
Greg Marshall came up with, fellow Wichita-metaller, Mark "The Shark" Shelton's nickname. Greg liked to rearrange letters from people's first and last names. He came up with "The Shark" by rearranging Mark Shelton's name into 'Shark Melton'.