Although friends and family told him that science was for geeks, Greg knew from a young age that he wanted to become a scientist.
Greg Sanders is originally from San Gabriel, California, US.
Statements from other characters and Greg himself have hinted that the Sanders family were from an upper middle class or wealthy background.
Grissom tells Greg that he needs to come clean, and that they will probably take the news well if he explains; in particular, Grissom states that his mother will be proud of him for saving a man's life.
In the season 7 episode "Post Mortem", Greg's split-second decision to run over one of the men threatening the tourist is found to be "excusable." The man's family disagrees with the verdict and serves Greg with a civil suit.
The character has often met with the disapproval of his supervisor Gil Grissom, due to listening to loud music such as Marilyn Manson while running lab machines and hiding porn magazines in some area cabinets.