Andrew F. O'Neill

William J. Serritella, Jr. is a top attorney recognized by Best Lawyers in the practice area(s) of Commercial Litigation. William J., 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 William J. is held by other top lawyers in the same geographic and legal practice area.

Michael leads Neal Gerber Eisenberg’s Private Equity, Venture Capital & Growth Companies practice, as well as its Fund Formation & Investment Management practice. Michael primarily represents private equity sponsors, venture investors, private funds, private equity and venture-backed companies, executives, and family offices. His extensive experience in complex transactional and corporate governance matters makes him an invaluable asset to his clients, who turn to him for advice...

Rebecca Fitzpatrick P.C. is a top attorney recognized by Best Lawyers in the practice area(s) of Environmental Law. Rebecca, 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 Rebecca is held by other top lawyers in the same geographic and legal practice area.

Jonathan Marks helps clients — often large insurers — develop investigation, claims handling and litigation strategies to detect, prevent and deter fraud. As an Assistant US Attorney, Jonathan tried numerous federal jury trials and argued appeals before the US Court of Appeals. As a lawyer in private practice, Jonathan has handled hundreds of insurance fraud investigations and dozens of fraud litigation matters. At every stage of counseling, investigation, litigation and in court,...

Recognized by her peers and clients as a leader in commercial real estate, Amy Blumenthal has more than 35 years of experience in all areas of real estate, including office, retail, hotel, industrial and luxury residential properties, often concentrating on acquisitions, sales and financing, as well as real estate development. Her clients, from a variety of industries such as manufacturing, hospitality, and food and beverage, value her ability to listen and understand their priorities and nee...

Emer Simic is a partner in the Intellectual Property Practice Group and focuses her practice on patent litigation and counseling in the pharmaceutical and biotech space. Emer has substantial experience successfully representing pharmaceutical and biotech companies in Hatch-Waxman and patent infringement disputes before the U.S. District Court and before the Patent Trial and Appeal Board (PTAB). A strategic advisor and compelling advocate, Emer partners with her clients to achieve their goals ...

Edward G. Willer is a Chicago personal injury lawyer and represents individuals and their families in serious personal injury and wrongful death cases in the areas of construction negligence, product liability, premises liability, and vehicular negligence. As a Partner at the Chicago law firm of Corboy & Demetrio, Mr. Willer has obtained numerous multi-million settlements and verdicts. His many accomplishments include a $7.5 million settlement he obtained in a federal court case for the f...

Sanford E. Perl (Sandy) concentrates on the corporate, securities and tax aspects of complex business transactions, including leveraged buy-outs of public and private companies; strategic mergers, acquisitions, investments and joint ventures; venture capital and growth equity investments; divestitures; initial public offerings; private equity fund formations; executive compensation; and debt and equity restructurings and workouts. He manages transactions in a wide variety of industries, inclu...

Marcelo Halpern is a partner with the firm's Business practice and a member of the Technology Transactions & Privacy group. Marcelo's practice focuses on transactional, strategic and corporate representation of global "FORTUNE 100" companies, start-up and emerging growth companies, as well as U.S.-based and international governments and non-profits. His experience includes structuring and negotiating technology and intellectual property-oriented strategic alliances and joint ventures; sof...

Michael E. Holden is a top attorney recognized by Best Lawyers in the practice area(s) of Personal Injury Litigation - Plaintiffs and Product Liability Litigation - Plaintiffs. Michael E., 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 Michael E. is held by other top lawyers in the same geographic and legal practice area.