After adding 28 lawyers here last year, Segal, McCambridge, Singer & Mahoney Ltd. opened an office in St. Louis this month.The firm now has more than 200 lawyers and serves as national counsel to 45 to 50 companies facing asbestos-related lawsuits. Chicago attorneys have been traveling to Madison County in Illinois and St. Louis County in Missouri for cases.“St. Louis is now becoming higher volume jurisdiction for asbestos litigation than ever before,” said firm co-chair and shareholder Jeffrey Singer.From …