Born in Oceanside, N.Y. and raised in Newburgh, Ind., Rosenbaum excelled in high school drama classes. Once hooked, he took on lead roles in college stage productions such as The Heidi Chronicles while attending Western Kentucky University and performing in regional theater during his summers.

Upon graduation with a degree in mass communications and theater, he packed his bags and headed for New York to pursue acting. He quickly landed roles in off-Broadway productions and small independent films, and soon segued into regular appearances on Late Night with Conan O'Brien in a sketch called The Amsterdam Kids.

His first real break came when he got a series regular role on The WB comedy series The Tom Show, with Tom Arnold. The relationship with the network continued as he was cast as Jack in the New York comedy Zoe, Duncan, Jack & Jane.

Most recently, Rosenbaum appeared on the big screen in Sweet November, which starred Keanu Reeves and Charlize Theron. He will be seen starring in the college sorority-set comedy Sorority Boys opposite Harland Williams and Barry Watson (The WB's 7th Heaven); and plays the lead role in the independent drama Poolhall Junkies with Christopher Walken, Rick Schroder and Chazz Palminteri. He also starred in the hit thriller Urban Legend and appeared in Midnight in the Garden of Good and Evil, directed by Clint Eastwood and starring Kevin Spacey and John Cusack.

Rosenbaum currently resides in Los Angeles. When not working, he belongs to an ice hockey league, a sport that he has played since childhood, and is a dedicated New York Rangers fan.