The pilot was never green-lighted, but Rosenbaum stood out as a newly discovered talent.A new MTV pilot was conceived specifically for Rosenbaum with the working title of The Michael Rosenbaum Project.After Smallville, Hartley starred opposite Mamie Gummer in The CW comedy-drama Emily Owens, M. He also guest-starred on Chuck, Castle, and Hart of Dixie, and from 2013 to 2014, he had a recurring role as Victoria Grayson's (Madeleine Stowe) illegitimate son, Patrick Osbourne, on the ABC primetime soap opera Revenge.
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Rosenbaum is also known for portraying Dutch Nilbog on FOX's Breaking In, and voiceover work in animation, such as his role of Wally West/the Flash in the DC animated universe.
Between 20, he played the lead role in the TV Land comedy series Impastor.
Hartley did a seven-episode run as billionaire Oliver Queen on the CW series Smallville later that year.
In 2008, he returned to Smallville as a regular cast member, following the departure of Kristin Kreuk and Michael Rosenbaum.