Prior to joining Marshall, Dennehey, Warner, Coleman & Goggin, Jason Banonis was an associate with Rawle & Henderson, LLP, where he handled premises liability, products liability, professional liability, commercial motor vehicle and general liability matters.

Before becoming an attorney, and while attending law school, he was a casualty claims representative with Crawford & Company where he managed premises liability and products liability matters. He also worked for the PMA Group as a client account representative, handling general negligence and professional liability cases for several government entities. He also served a judicial externship with Judge Richard Gebelein of the Superior Court of Delaware.