BDO USA, P.C. is the United States member firm of BDO International and one of the largest accounting and professional-services firms in the U.S., offering assurance, tax and consulting from more than 75 offices. Founded in 1910 as Seidman & Seidman and headquartered in Chicago, it has over 11,000 employees. Matthew Becker became CEO on 1 July 2026, succeeding Wayne Berson.