After spending nearly five years as an in-house leader at Visa Inc., Michael Dashefsky, a former federal antitrust attorney who also had a stint with Big Law, has returned to private practice.

Dashefsky joined Bass, Berry & Sims earlier this week as a partner and co-chairman of the firm’s antitrust and trade practices group in Washington, D.C. He’ll represent clients on antitrust matters related to mergers and acquisitions, nonmerger investigations, joint ventures and other strategic transactions.