Bill is a seasoned trial lawyer who represents individual and corporate clients in federal criminal investigations, regulatory enforcement actions, civil litigation, and corporate internal investigations. He has experience in federal district and appellate courts across the country, including first-chair trial experience in both civil and criminal cases.

He represents corporations and individuals accused of alleged wrongdoing, such as fraud, political corruption, tax evasion, extortion, bribery, foreign corrupt practices, and antitrust violations. Bill is familiar with the technical coding and billing requirements of federal health care programs, and he frequently advises health care providers in responding to government audits and subpoenas, and, if necessary, in litigating civil or criminal charges. He also counsels providers in defending against claims brought by qui tam relators.

Bill has experience in defending clients involved in investigations and enforcement actions conducted by the SEC, IRS, CFTC, OCC, ICE, FDA, USDA, and other regulatory agencies. He has been involved in several investigations related to the EB-5 visa program, government purchasing rules, anti-dumping duties, and the marketing of pharmaceuticals.

His civil litigation has involved a range of executive employment and compensation disputes, unfair competition and corporate breach of contract cases, and insurance matters.

  • Experience

    • Lead trial counsel in winning a not guilty verdict on bank fraud charges for our client, who was charged in the Eastern District of Texas with defrauding lenders through real estate transactions designed to take advantage of a federal tax incentive implemented after Hurricane Katrina.
    • Represented key players in many high-profile criminal investigations, including the General Motors’ ignition switch and Takata airbag recalls, and the federal inquiry into United Airlines’ ties to the Port Authority of New York and New Jersey.
    • Represented Antoin Rezko, an advisor to former Illinois Governor Rod Blagojevich, in a three-month trial in Chicago.
    • Represented the lead defendant in the TAP Pharmaceuticals case, which culminated in the acquittal of all individual defendants after a three-month jury trial in Boston.
    • Led discovery and was second chair in the trial defense of a Blue Cross/Blue Shield of Illinois executive, which ended in an acquittal after a lengthy trial in the Southern District of Illinois.
    • Represented a former attorney who was charged with developing complex tax shelters promoted by major law firms, banks, and brokerage houses during a four-month trial in New York.
    • Led the trial defense of the owner of a California pharmacy charged with criminal health care fraud offenses.
  • Credentials


    • Northwestern Pritzker School of Law, J.D., 1994
      Journal of Criminal Law and Criminology, Coordinating Note Editor
    • Wake Forest University, B.A., Political Philosophy, 1991, magna cum laude

    Bar Admissions

    • Illinois
    • U.S. Court of Appeals for the Seventh Circuit
    • U.S. District Court for the Northern District of Illinois (Trial Bar)
    • U.S. District Court for the Northern District of Indiana

        Professional Memberships

        • American Bar Association
        • Chicago Bar Association
        • Seventh Circuit Bar Association
      • Insights

        News Release

        Schiff Advised Altaris on $1.1 Billion Take-Private Acquisition of Analogic

        Schiff Hardin LLP served as legal counsel to Altaris Capital Partners in connection with an Altaris affiliate’s acquisition of Analogic Corporation for approximately $1.1 billion.

        News Release

        Schiff Hardin Secures Probationary Sentence for Chicago Corporate Executive

        Schiff Hardin secured a probationary sentence for a former Amtrak official who pleaded guilty in October 2017 to steering business to his wife’s company and making false statements.

        News Release

        95 Schiff Hardin Lawyers Named to 2018 Leading Lawyers Lists

        Ninety-six Schiff Hardin lawyers have been named to the 2018 Leading Lawyers lists for Illinois and Michigan.

        News Release

        40 Attorneys Named to 2018 Illinois Super Lawyers, Rising Stars, and Top Women Lists

        Forty Schiff Hardin attorneys have been recognized on the 2018 Illinois Super Lawyers and Rising Stars lists.

        News Release

        Brett Immel Wins Complete Acquittal in Texas Trial

        Schiff Hardin LLP Defeats Charges Against Chicago Businessman

        News Release

        Schiff Hardin Adds White Collar Defense Lawyer William Ziegelmueller in Chicago

        Ziegelmueller is an experienced trial lawyer who represents individual and corporate clients in federal criminal investigations, regulatory enforcement actions, civil litigation, and corporate internal investigations.

        News Release

        99 Schiff Hardin Attorneys Named to 2017 Leading Lawyers List

        Ninety-nine Schiff Hardin lawyers have been named to the 2017 Leading Lawyers list for Illinois and Michigan.