They say it's the quiet ones you have to watch out for, which is something veteran character actor Leland Orser knows all too well. The California-born actor has the kind of boyish good looks that go a long way in concealing the black heart of his deranged, neurotic, and often unstable characters. First there was the flamboyant drug dealer in the thriller "Cover Story" (1993); then the john driven to unspeakable violence in "Se7en," (1995); and his duplicitous best man in the bachelor party-gone-wrong comedy "Very Bad Things" (1998). A turn as a vengeful lab technician in "The Bone Collector" (1999) highlighted Orser's serial killer creepiness, while a recurring role as surgeon Lucien Dubenko on the long-running "ER" (NBC, 1994-2009) showcased his tight-lipped arrogance. Married to actress Jeanne Tripplehorn since 2000, Orser stepped behind the camera in 2007 for the short film "Morning," which he later expanded into a feature film starring himself and Tripplehorn. After portraying Liam Neeson's right-hand man in "Taken" (2008) (and 2012's inevitable "Taken 2"), Orser brought his paranoid tendencies to primetime as a political consultant on "24" (Fox, 2001-2010) and as a weapons specialist on the blackout drama "Revolution" (NBC, 2012- ). Looks like Orser isn't so quiet anymore.