In the law firms Much, Shelist P.C. added Josh M. Leavitt as a principal in its construction law practice group. It also elevated Sheryl Jaffee Halpern to chair of its labor and employment practice group and Courtney E. Mayster to co-chair of its real estate group. Leavitt advises both domestic and international clients, including owners, contractors, architects, engineers, suppliers, manufacturers and commercial landlords and tenants on construction law matters. He was previously with K&L Gates LLP. Halpern …