Justin P. O'Brien

Adrianne Ortega is a top attorney recognized by Best Lawyers in the practice area(s) of Health Care Law. Adrianne, who practices law in Boston, Massachusetts, has been recognized since 2021. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Adrianne is held by other top lawyers in the same geographic and legal practice area.

Stephanie Berdik is a partner in the Investment Funds Practice Group in the Boston office of Kirkland & Ellis LLP. Stephanie’s practice focuses on advising U.S. and non-U.S. private investment fund sponsors on all aspects of their business, including establishment of private investment funds, portfolio investment activities, capital raising, fund regulatory and compliance matters, and firm ownership and operational issues. She has worked with a variety of private fund sponsors and, ...

Eric R. Reimer is a top attorney recognized by Best Lawyers in the practice area(s) of Banking and Finance Law and Securities / Capital Markets Law. Eric R., who practices law in Boston, Massachusetts, has been recognized since 2012. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Eric R. is held by other top lawyers in the same geographic and legal practice area.

Jennifer L . Chunias is a top attorney recognized by Best Lawyers in the practice area(s) of Criminal Defense: White-Collar and Privacy and Data Security Law. Jennifer L ., who practices law in Boston, Massachusetts, has been recognized since 2024. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Jennifer L . is held by other top lawyers in the same geographic and legal practice area.

Ilan Barzilay is an intellectual property practitioner specializing in obtaining and enforcing patent rights. Ilan leads a team of attorneys that procures patents for clients ranging from technology startups and research institutions to established companies and multinational corporations. He is a trusted advisor to clients seeking meaningful patent protection crafted to align with important business goals. His practice also includes handling contentious matters in the federal courts and befo...

Chad Dale is a partner in Proskauer’s Corporate Department and a member of both the Business Solutions, Governance, Restructuring & Bankruptcy and Private Credit Restructuring Groups. Chad has 30 years of experience in corporate reorganizations and debt restructurings. As a member of the Private Credit Restructuring Group, Chad’s practice focuses on direct lenders and ad hoc groups of direct lenders, hedge funds and BDC’s. He also represents troubled companies, equity sp...

Mark T. Bettencourt is a top attorney recognized by Best Lawyers in the practice area(s) of Corporate Law, Mergers and Acquisitions Law, Technology Law and Venture Capital Law. Mark T., who practices law in Boston, Massachusetts, has been recognized since 2009. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Mark T. is held by other top lawyers in the same geographic and legal practice area.

Ms. Whelan's practice includes Patent Office practice, litigation, and counseling in the field of life sciences, including chemistry, biotechnology and pharmaceuticals. Her experience includes patent strategy across the spectrum from pre-litigation investigation and litigation, to Patent Office post-grant proceedings including inter partes review and reexamination, to analysis of the competitive landscape and IP due diligence, as well as obtaining patent protection and portfolio management.

Stacey Pietrowicz is a top attorney recognized by Best Lawyers in the practice area(s) of Medical Malpractice Law - Plaintiffs, Personal Injury Litigation - Plaintiffs and Product Liability Litigation - Plaintiffs. Stacey, who practices law in Boston, Massachusetts, has been recognized since 2026. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Stacey is held by other top lawyers in the same geographic and legal practice area.

Russell A. Gaudreau, Jr. is a top attorney recognized by Best Lawyers in the practice area(s) of Employee Benefits (ERISA) Law. Russell A., who practices law in Boston, Massachusetts, has been recognized since 1987. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Russell A. is held by other top lawyers in the same geographic and legal practice area.