Three widely recognized standards for evaluating law firms and lawyers are law schools attended, board certification, and an "av" rating from Martindale Hubbell. Mitchell Law Group, P.A. is an "av" rated firm and Bill is board certified in labor and employment law. Bill's law degrees are from the University of California at Berkeley and Georgetown, both of which are usually ranked top ten in the United States.

Bill has been designated as a Leading Florida Attorney and is the author of The Estate and Retirement Planning Answer Book and the coauthor of Employee Fringe and Welfare Benefit Plans. He has practiced in Tampa for 20 years. Mitchell Law Group, P.A. has been in business for ten years. For three years Bill was a staff attorney assigned to litigate major antitrust cases for the Federal Trade Commission in Washington, D.C. He is a Florida Supreme Court Certified Mediator and is certified to mediate in federal court. He was designated a Florida super lawyer in 2009.