John J. O'Sullivan

Andrew advises public and private companies on plan design and administration, fiduciary responsibility, claims procedures, and disclosure requirements under ERISA, the Internal Revenue Code, and other laws. He has extensive experience guiding them regarding the legal, financial, and administrative issues that affect qualified and nonqualified retirement plans, health and welfare plans, and other employee benefit arrangements, including issues that arise during mergers, acquisitions, and othe...

Steven H. Sklar is a top attorney recognized by Best Lawyers in the practice area(s) of Biotechnology and Life Sciences Practice and Litigation - Intellectual Property. Steven H., who practices law in Chicago, Illinois, has been recognized since 2022. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Steven H. is held by other top lawyers in the same geographic and legal practice area.

Patrick D. Owens is a top attorney recognized by Best Lawyers in the practice area(s) of Trusts and Estates. Patrick D., 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 Patrick D. is held by other top lawyers in the same geographic and legal practice area.

Jeff is an experienced trial lawyer and business advisor in the area of labor and employment law. Jeff advises clients on wage and hour compliance, reductions in force, enforcement of restrictive covenants, employment contracts and separation agreements, employee selection and discipline, WARN compliance, employment policies, internal investigations and business transactions. He has spoken on several employment-related topics, including effective employment documentation, joint employer liabi...

Alexandra N. Van Dusen is a top attorney recognized by Best Lawyers in the practice area(s) of Gaming Law. Alexandra N., who practices law in Chicago, Illinois, has been recognized since 2027. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Alexandra N. is held by other top lawyers in the same geographic and legal practice area.

Ziemowit T. Smulkowski is a top attorney recognized by Best Lawyers in the practice area(s) of Tax Law. Ziemowit T., 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 Ziemowit T. is held by other top lawyers in the same geographic and legal practice area.

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...

Nationally known for successfully representing clients in personal injury matters, Mr. Steven M. Levin is an outstanding attorney, successful entrepreneur and, most importantly, a committed family man. his family values carry over into everything he does, from representing people seeking better care for their elderly loved ones to building a law firm that has become one of the best in the nation at winning substantial verdicts and settlements for people affected by medical malpractice, nursin...

As bond and underwriter's counsel, Lewis Greenbaum advises state and local governments, nonprofits and public-private partnerships on a range of general obligation and revenue bond financings. With a public finance practice spanning more than 40 years, Lew has been involved in hundreds of high-profile public projects and public-private partnerships. Lew also advises on public finance legislation. He is the co-author of the Local Government Debt Reform Act and the Municipal Bond Reform Act, tw...

Jeffrey P. Armstrong is a top attorney recognized by Best Lawyers in the practice area(s) of Patent Law. Jeffrey P., 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 Jeffrey P. is held by other top lawyers in the same geographic and legal practice area.