Robert John Burke (born September 12, 1960) is an American actor. Burke is a castmember on Denis Leary's Rescue Me and plays Bart Bass on The CW's Gossip Girl. He was working on the TV series Kidnapped for NBC and was a featured character on ABC's series Six Degrees. Burke has also had recurring roles on Law & Order and Law & Order: Special Victims Unit (where he has the recurring role of NYPD Internal Affairs lieutenant Ed Tucker, a frequent nemesis for the SVU detective squad), and appeared on The Sopranos in 2004. He was also on Sex and the City in seasons four and five playing Miranda's hookup. Also, in 2004 Burke played the role of Mr. Neck in the independent film Speak. Burke's largest mainstream role to date has been taking over the lead from Peter Weller in RoboCop 3. He is notable for being a regular performer in fellow Purchase alum Hal Hartley's indie films, such as 1989's The Unbelievable Truth and 1992's Simple Men. He also had a small role in Hartley's 1995 film Flirt. He starred in Richard Stanley's 1993 film Dust Devil, and in 2001's No Such Thing, in which he plays a foul-mouthed mythical beast living in Iceland.