William G. Sullivan is Senior Counsel in the Litigation Practice Group in the Clark Hill Chicago office. William tries cases. He has over 35 years of experience trying cases in both state and federal courts. His practice is divided almost equally between representation of plaintiffs and defendants, including companies of all sizes and individuals. William has represented defendants in civil and criminal securities and antitrust cases and both civil and criminal RICO cases. He also has served as plaintiff’s counsel in civil RICO cases. He has litigated more than 100 contested hearings involving temporary restraining orders and preliminary injunctions. As plaintiff’s counsel, William has successfully prosecuted dozens of civil fraud cases and represented clients in civil rights actions and trade secrets. He has guided individuals and businesses through corporate governance and compliance issues involving state and federal regulatory agencies. He has represented clients in Foreign Corrupt Practices Act and World Bank investigations. He has tried cases in the U.S. Tax Court with other members of his office that have resulted in the savings of hundreds of millions of dollars.
Prior to joining Clark Hill, William was a founding principal of Martin, Brown, Sullivan, Roadman & Hartnett, Ltd. During his 26 years with the firm he tried cases in state courts, United States District Courts and the United States Tax Court. He also represented clients in the Illinois Appellate Court and the United States Courts of Appeals for the 5th, 7th and 11th Circuits.
William has served in the Office of the Illinois Attorney General. He served as Chief of both the General Law and Consumer Protection Divisions and was appointed Chief of the Toxic Waste Strike Force. He also supervised the Public Utilities and Anti-Trust Divisions. Since leaving the Illinois Attorney General's Office he has been appointed by the four successor attorneys general as a special assistant attorney general. He has litigated cases in the state and federal courts on behalf of the state of Illinois, including a class action in which he represented the Illinois Toll Highway Authority.
William is a member of the Board of Directors of Marquette Bank and of Marquette National Corporation, a bank holding company. He serves on the Audit Committee, the Nominating and Corporate Governance Committee and Asset and Liabilities Committee of those institutions. He chairs the Compliance and Regulatory Committee. He is a member of the Nominating and Corporate Governance Committee (2010 - present) and Audit Committee (2010 - present).
