Bonnie was born in New York City and attended the UN International School and NYU. In addition to guest appearances on NBC's "Law & Order", "Law & Order: SVU", CBS's "The Education of Max Bickford" with Richard Dreyfuss, Sidney Lumet's "100 Centre Street"on A&E and ABC's "Ugly Betty", Bonnie was a member of the cast of NBC's "Third Watch" as well as CBS's "Guiding Light". Her film work has included "Black Irish" with Michael Angarano and "Stake Land" with Connor Paolo, due out in 2010. Off Broadway, Bonnie starred in David Rabe's Hurlyburly and recently made her Broadway debut as Scarlett Johansson's understudy in Arthur Miller's A View From the Bridge. Bonnie's sister is photographer Sally Dennison, also a New York native.
