Thirteen lawyers from the Chicago and St. Louis offices of Segal McCambridge Singer & Mahoney have left to join Delaware-based Maron Marvel Bradley Anderson & Tardy LLC.The attorneys will open offices in the two cities they had been practicing in.Maron Marvel focuses its work on high-stakes toxic tort litigation. All of the 13 attorneys from Segal McCambridge either work in that area or in related practice areas. The group includes five attorneys who have been named as directors at Maron Marvel. The team also …