Winston & Strawn LLP added Dane A. Drobny as a partner in its Chicago office and as a member of the transactions department.Drobny previously worked for the firm as a partner for 18 years. He returns after serving as Groupon’s chief administrative officer, general counsel and corporate secretary. He oversaw the company’s legal and human resources functions.• Wallace Miller added Molly Condon Wells as the firm’s newest partner. She represents plaintiffs in large-scale complex litigation, including …