Sheller P.C. managing partner Brian J. McCormick Jr., whose practice is heavily focused on pharmaceutical mass torts and whistleblower litigation, is leaving the firm to join Ross Feller Casey, both firms confirmed Friday.

Ross Feller principals Matthew A. Casey and Joel Feller said McCormick will be directing the firm’s new mass tort and whistleblower department along with Mark A. Hoffman, who joined the firm from Kline & Specter in February.