Bruce P. Weisenthal

Joseph R. Lanser is a top attorney recognized by Best Lawyers in the practice area(s) of Patent Law. Joseph R., who practices law in Chicago, Illinois, has been recognized since 2019. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Joseph R. is held by other top lawyers in the same geographic and legal practice area.

Daniel T. Ryan is a top attorney recognized by Best Lawyers in the practice area(s) of Mass Tort Litigation / Class Actions - Plaintiffs, Personal Injury Litigation - Plaintiffs and Product Liability Litigation - Plaintiffs. Daniel T., 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 Daniel T. is held by other top lawyers in the same geographic and legal practice area.

Charles W. Mulaney, Jr. focuses on mergers and acquisitions (friendly and hostile), corporate governance and corporate financings. He counsels clients on a broad range of securities and corporate matters, including disclosure issues, the duties of directors and shareholder activism. Mr. Mulaney represents special committees of directors in transactions and internal investigations. He also advises major investment banks on acquisition and financing matters and has represented issuers and under...

Heidi Steele is a top attorney recognized by Best Lawyers in the practice area(s) of Corporate Law. Heidi, who practices law in Chicago, Illinois, has been recognized since 2026. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Heidi is held by other top lawyers in the same geographic and legal practice area.

Michael Carrillo advises individuals and businesses on patent, trademark, copyright and trade secret matters, as well as on foreign and domestic patent and trademark protection. Michael navigates clients through and beyond developing, managing and policing small and large IP portfolios, creating practical strategies that leverage his clients’ assets while safeguarding their bottom line. A member of the firm’s Management Committee, Michael is listed among The Best Lawyers in Americ...

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...

Jennifer M. Mikulina is a top attorney recognized by Best Lawyers in the practice area(s) of Trademark Law. Jennifer M., who practices law in Chicago, Illinois, has been recognized since 2016. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Jennifer M. is held by other top lawyers in the same geographic and legal practice area.

Steven M. Malina is a top attorney recognized by Best Lawyers in the practice area(s) of Litigation - Securities. Steven 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 Steven M. is held by other top lawyers in the same geographic and legal practice area.

Jim Gaughan is a tough, talented, and experienced commercial litigator who has used his considerable experience and equanimity to successfully represent clients in a wide range of complex and challenging class action lawsuits in jurisdictions across the country. He is relentless about preparation and tactics, constantly weighing and analyzing the respective strengths of his clients, as well as their adversaries, in order to create the most effective and efficient legal strategies.

Peter H. Lieberman is Co-Chair of the Chicago Corporate & Securities Practice. He has more than 20 years of broad experience in mergers and acquisitions, public company, and hedge fund matters, private equity, start-up and venture capital, and related securities regulation issues. Peter brings to his work a diverse transactional background, including a decade-long involvement in hedge fund transactions and securities trading and hedging issues. He has been involved in scores of PIPE and r...