Jonathan M. Woodward was the actor who portrayed Holden Webster in "Conversations with Dead People" and Knox on Angel.
He also played Tracey Smith in The Message, an episode of Firefly.
Jonathan also appeared in NCIS in the Season 4 episode, Once a Hero, four years after first appearing on Buffy.
Coincidentally, Jonathan's first acting performance was in a production of Count Dracula performed at his local library when he was 6 years old.
Along with Jeff Ricketts, Andy Umberger, Bob Fimiani, and Carlos Jacott, he is one of only five actors to appear in the first three series created by Joss Whedon.