William P. "Bill" Sweeney

Thomas J. Wimbiscus, a shareholder with McAndrews, has more than thirty years of experience and practices in all areas of intellectual property litigation, with a special emphasis on patent and trademark litigation. He has appeared in over 100 litigations and over 100 inter partes reviews (IPRs). He was named one of the 10 most active IPR practitioners in the U.S. for patent owners. (Patexia 2018.) Tom was named as one of the world’s leading patent professionals by IAM Patent 1000 in 20...

Bill Arnault is a litigation partner in the Firm’s Chicago office. He focuses his practice in the restructuring context. He also has extensive experience litigating complex commercial cases in federal and state trial and appellate courts throughout the United States, including contract, energy, fiduciary duty, fraudulent transfer, bankruptcy, and employment cases. He has chaired or co-led multiple trials and hearings, including disputes involving Parker Drilling Company, Emerald Oil, In...

Bill provides strategic counsel to numerous clients regarding the development, protection and monetization of sophisticated global intellectual property portfolios. His practice includes a wide array of intellectual property matters with a particular emphasis portfolio management and long-term portfolio strategy development, management of defense and enforcement actions, infringement and clearance analyses, technology agreements, licenses and transfers, and strategic guidance on significant c...

Bill Welke focuses his practice on the tax aspects of complex business transactions and entities, including: mergers, acquisitions, and leveraged buyouts; venture capital and other private equity investments; formation of private equity funds; joint ventures and partnerships; workouts and restructurings; tax contests and controversies. Described as having “encyclopedic knowledge of tax structuring strategies” and “adept at cross-border international tax planning in the conte...

Guinevere M. Moore is a top attorney recognized by Best Lawyers in the practice area(s) of Litigation and Controversy - Tax. Guinevere M., who practices law in Chicago, Illinois, has been recognized since 2023. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Guinevere M. is held by other top lawyers in the same geographic and legal practice area.

Matthew Steinmetz focuses primarily on leveraged buyouts of public and private companies, as well as recaps and joint ventures. His experience spans a wide variety of sectors, including technology, media, healthcare, industrials and retail. His principal clients include both large cap and middle cap leveraged buyout funds, located in the U.S. and abroad. In addition to his considerable transactional work, he is a trusted advisor to a number of senior PE fund managers.

As employers increasingly seek to hire and retain talented foreign national employees to maximize competitiveness, Tejas is empathetic to their needs and offers practical immigration law advice. He is committed to guiding employers of all sizes – across a diverse cross-section of industries, including finance, banking, education, transportation, and healthcare – in efficiently and economically sponsoring workers for permanent residency in the United States through Program Electron...

For the past two decades, Mike has been assisting clients develop and defend their patent portfolios. A former Army officer and Ford Motor Company design engineer, clients appreciate Mike’s organized approach to problems and his ability to communicate with inventors across a wide swath of technologies. Mike is a full spectrum patent attorney and is himself a patentee. On the prosecution side, Mike has procured patents in nearly every art group other than bio/pharma and has an almost per...

David A. Golin is a top attorney recognized by Best Lawyers in the practice area(s) of Bankruptcy and Creditor Debtor Rights / Insolvency and Reorganization Law. David A., who practices law in Chicago, Illinois, has been recognized since 2025. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which David A. is held by other top lawyers in the same geographic and legal practice area.

Joseph E. Tilson is Co-Chair of Cozen O'Connor's Labor & Employment Department and a member of the Management Committee and Board of Directors. Joe represents employers in large-scale employment litigation and labor arbitrations. In the past 35 years, he has tried more than 150 jury and non-jury cases before the full range of courts, administrative agencies and labor arbitrators. His clients include a number of the country’s largest public and private employers, and Illinois’ ...