After nine years at Trimont Real Estate in Atlanta, Aaron “A.J.” Hammond has joined Birdsey Group as director of commercial services. He started Monday in the firm’s Atlanta headquarters, reporting to managing director Robert Burton. Hammond heads a 12-member team that underwrites and analyzes non-agency commercial mortgages for clients. Plans call for adding another four or five staffers to the unit in Dallas and Irvine, Calif., within a year, including underwriters with 4-5 years of experience and analysts with 2-3 years in the business. Hammond was a director at Trimont, focusing on commercial¬ mortgage underwriting and due diligence for banks, life companies and fund shops.