After graduating from Wheaton College in Illinois in 1986, David co-founded The Stubblebine Company along with the late Robert D. Stubblebine in 1987. In addition to serving as a company principal and director, David specializes in selling and leasing large flex and single-story industrial vacant and investment properties throughout New England primarily in the Suburban Boston market. David has represented numerous large corporations including Coca Cola, Textron Defense Systems, Cincinnati Milacron, Massachusetts School of Law, Compaq Computer, Costar, The Paper Store, Ryerson Steel, American Power Conversion, and Interstate Container.

In 2003, David attained the Commercial Broker Association Platinum Level, the highest ranking level based on aggregate sales and leasing volume. In addition, he received the distinction of being ranked among the Top 20 leasing brokers in 2004 and 2007 based on total aggregate lease transaction volume for those calendar years.