'"[3] Hallisay made his television debut in 2005, appearing on Fox's The Inside, with Rachel Nichols and Adam Baldwin, as well as Lifetime's Strong Medicine, opposite Patricia Richardson.
[4] On The CW's drama Privileged, Hallisay played Will Davis, a charming and wealthy Palm Beach bachelor who is delighted to learn that his next-door neighbors have hired a beautiful tutor named Megan Smith (Joanna García).
Since then, he has landed roles in Bones, Medium, Bionic Woman, and CSI: NY, opposite Gary Sinise.
[5] In 2006, he made his feature debut in Erik MacArthur's Bottoms Up, starring Paris Hilton and Jason Mewes.
Hallisay played the boyfriend to Hilton, a socialite who helps Mewes save his failing small-town restaurant.