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Danny Strong

Strong was a regular on The WB, playing bullied outcast Jonathan Levinson on "Buffy the Vampire Slayer" and Paris's editor boyfriend Doyle on "Gilmore Girls." He joined "Mad Men" in Season 4 as marginally talented copywriter Danny Siegel, but Strong has also proven to be a very talented screenwriter, penning HBO's recent political docudramas "Recount" and "Game Change."

Do You Recognize These 'Mad Men' Guest Stars?

The halls of Sterling Cooper & Partners have been filled with a lot of familiar faces lately. Here are more than 20 "Mad Men" guest stars we recognize from previous roles in TV and movies. — Dave Nemetz, Yahoo! TV