Heather M. O'Shea

Leslie Smith is a litigation partner and was a long-time member of the Firm’s Global Management Committee. She concentrates her practice in the areas of antitrust, class action, and consumer fraud litigation. The Legal 500 stated that Leslie has a ‘good strategic approach’, ‘demonstrates personal commitment to the company’s cause’ and ‘acquires and deploys the best firm talent appropriately’. Leslie is highlighted as “2017 Life Science Sta...

Edward A. Mas II is a Shareholder at McAndrews, and has been described by his clients and peers as a “terrifically savvy litigator” who “routinely secures the best position for his clients.” As an advocate, he is “experienced, smart, aggressive, and effective.” For more than twenty years, Ed’s trial and appellate litigation practice has focused on complex patent and technology-related litigation. He has served as lead trial counsel in numerous patent ...

An accomplished trial lawyer, Tery Gonsalves draws on his prior roles as a police detective and deputy general counsel to provide strategic guidance to clients facing investigations and complex litigation matters, including regulatory and compliance counseling. As chair of the Education Team, he regularly counsels public and private institutions through the issues they face in a highly regulated landscape. Tery is a seasoned trial lawyer who has tried more than 20 cases to verdict. He represe...

Olivia is an intellectual property litigator who represents individuals and corporations across the country in complex technological matters. She helps clients protect, enforce, and defend intellectual property rights, including patents, trade secrets, copyrights and trademarks. An experienced trial lawyer, Olivia has litigated and tried significant cases before the U.S. District Court for the Northern District of Illinois and other federal courts around the country, and has also briefed and ...

Joshua G. Vincent is a top attorney recognized by Best Lawyers in the practice area(s) of Appellate Practice. Joshua G., who practices law in Chicago, Illinois, has been recognized since 2014. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Joshua G. is held by other top lawyers in the same geographic and legal practice area.

Brett M. Buckley is a top attorney recognized by Best Lawyers in the practice area(s) of Family Law. Brett M., who practices law in Lake Forest, Illinois, has been recognized since 2021. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Brett M. is held by other top lawyers in the same geographic and legal practice area.

Patrick J. Arnold, Jr. is a top attorney recognized by Best Lawyers in the practice area(s) of Litigation - Intellectual Property, Patent Law and Trademark Law. Patrick J., who practices law in Chicago, Illinois, has been recognized since 2024. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Patrick J. is held by other top lawyers in the same geographic and legal practice area.

Carolyn M. Passen is a top attorney recognized by Best Lawyers in the practice area(s) of Trademark Law. Carolyn 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 Carolyn M. is held by other top lawyers in the same geographic and legal practice area.

Dan Boho has a national trial and mediation practice with verdicts in Illinois, California, New York, New Jersey and Pennsylvania and appearances as pro hac vice counsel in 18 states. Mr. Boho, State Chair of the prestigious American College of Trial Lawyers and Fellow of the International Academy of Trial Lawyers (600 top trial lawyers from the US and 30 other countries), handles high-profile, media-intensive matters. He served as General Counsel of the 22,000 member Chicago Bar Association,...

Steven (Steve) S. Scholes is the global head of McDermott’s Litigation Practice Group. His practice focuses on SEC investigations, shareholder litigation, including class and derivative actions, and internal investigations. Steve is an experienced trial lawyer, and he has tried civil, criminal and administrative cases in federal and state courts. He regularly represents clients before the Securities and Exchange Commission, state securities regulators and self-regulatory organizations, ...