Greenberg, Traurig LLP has opened a trusts and estate practice in Chicago by acquiring more than 500 clients via three lawyers who worked at Jenner & Block LLP for about a decade. Joining Greenberg, Traurig as shareholders this month are John J. Buttita, John W. Newlin and Debra M. Doyle. Buttita heads the practice group. The trio comprised Jenner & Block’s private client practice group. Buttita’s practice focuses on representing high-net-worth individuals and families who face issues involving …