Colleen Kelly Gomos

Tom is an intellectual property attorney who regularly counsels clients on patent and trademark prosecution, IP litigation, and post-grant patent challenges before the Patent Trial and Appeal Board (PTAB). His practice reflects a balance of strategic portfolio development and dispute-driven risk assessment, uniquely blending transactional work with intellectual property litigation. This integrated approach enables him to advise clients with a practical, end‑to‑end perspective on how patents a...

Nicole K. Mann focuses her practice on all aspects of tax and estate planning, estate and trust administration and family business planning. She also has considerable experience in estate, trust and tax litigation involving disputes between and among family members, fiduciaries and beneficiaries. Nicole is a co-chair of the Firm’s Trust & Estate Controversy group. Read full biography: https://www.mwe.com/people/mann-nicole-k/

Kathryn Kovitz Arnold is a lawyer recognized by Best Lawyers in the practice area of Real Estate Law. Kathryn Kovitz practices law in Chicago, Illinois Best Lawyers has recognized Kathryn Kovitz Arnold since 2010. The Best Lawyers recognition is based on a peer-review survey of lawyers in the same geographic region and legal practice area. The recognition reflects the professional regard in which Kathryn Kovitz Arnold is held by other lawyers.

Ana Valenzuela is a lawyer recognized by Best Lawyers in the practice area of Immigration Law. Ana practices law in Chicago, Illinois Best Lawyers has recognized Ana Valenzuela since 2026. The Best Lawyers recognition is based on a peer-review survey of lawyers in the same geographic region and legal practice area. The recognition reflects the professional regard in which Ana Valenzuela is held by other lawyers.

Dan Laytin is a litigation partner in Kirkland’s Chicago office. His practice is principally concentrated in the areas of antitrust and other complex litigation. Dan has been recognized as a leading antitrust practitioner by Chambers every year from 2006 to 2022; by The Legal 500 U.S. for antitrust in 2007, 2010, 2012–2014, 2016–2022, and for appellate: supreme court in 2017; and by The Best Lawyers in America, U.S. News and World Report, Best Lawyers® from 2013 to 2023....

Sandra (Sandy) M. DiVarco focuses her practice on the representation of hospitals and health systems. She has counseled health care facility and system clients regarding all aspects of health law transactions and health system restructurings. Read full biography: https://www.mwe.com/people/divarco-sandra-m/

Roger J. Jones represents clients in tax controversy and litigation matters at all levels of the federal court system, before the Internal Revenue Service (IRS), and before various state courts and tax agencies. He has represented taxpayers, including numerous Fortune 500 companies, in more than 80 docketed cases before the US Supreme Court, most of the US courts of appeals, federal district courts, the US Court of Federal Claims and the US Tax Court. Read full biography: https://www.mwe.com/...

David Koropp is a lawyer recognized by Best Lawyers in the practice area of Commercial Litigation. David practices law in Chicago, Illinois Best Lawyers has recognized David Koropp since 2023. The Best Lawyers recognition is based on a peer-review survey of lawyers in the same geographic region and legal practice area. The recognition reflects the professional regard in which David Koropp is held by other lawyers.

Drawing on nearly 40 years of combined experience as a federal prosecutor and defense attorney, Sheldon Zenner expertly navigates his clients through high-stakes matters, including government and internal investigations, regulatory proceedings, all phases of criminal matters and related civil litigation. Sheldon's diverse client base is made up of corporations, high-ranking executives and company owners across a wide range of industries, including financial services, health care and entertain...

Charles A. Porretta is a Chicago, Illinois personal injury lawyer with Cooney & Conway LLP. He earned his law degree from The John Marshall Law School in 1991 and has represented individuals who suffered serious injuries as a result of negligence, as well as families pursuing wrongful death claims. Mr. Porretta focuses his practice on asbestos litigation and represents plaintiffs in mass tort and class action matters. His experience also includes product liability, aviation law, transport...