Jacob K. Javits Convection Center of New York,. Edward A. Garmatz United States Courthouse,. Social Security Headquarters,. Cannon Group is a pro-active team member providing cost effective solutions satisfying our client's needs and budgets. American Institute of Architects. National Roofing Contractors Association. HJCannongroup.com is optimized for Mozilla Firefox. 520 Fellowship Road, Suite A-111, Mt. Laurel, New Jersey 08054-3407. Phone: 856-914-0900 / 800-233-6986 / Fax: 856-914-0600.