Get to Know NCIS' Brian Dietzen
HE PLAYS NCIS' handsomely bespectacled nerd Jimmy Palmer, who assists medical examiner Ducky (David McCallum). Dietzen came in to shoot a one-day guest appearance near the end of the first season — and has been on most of the episodes since, thanks to "his comic timing and the way he plays so well with McCallum," says exec producer Shane Brennan.
