Gregory Leighton

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...

Shilpi Gupta is a top attorney recognized by Best Lawyers in the practice area(s) of Corporate Law and Mergers and Acquisitions Law. Shilpi, 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 Shilpi is held by other top lawyers in the same geographic and legal practice area.

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

Jason is a litigator and strategic counselor in all aspects of labor and employment law. He litigates unfair labor practices before the NLRB, arbitrates labor grievances, negotiates and administers collective bargaining agreements, and develops long-term labor strategies to maximize the value and effectiveness of each client’s workforce. He also litigates and provides daily counsel on matters arising out of the numerous federal and state counterpart statutes governing employers, includi...

Mark Grossmann is global chair of Katten's Corporate practice. Mark knows how to make deals happen. For more than 20 years, he has guided principals and finance sources alike through critical transactions that have helped them grow, compete and realize value. He is known for a refreshingly direct approach that cuts away extraneous issues and gets to the heart of what the parties need. Mark knows that lawyers are often seen as obstacles who can bury the deal in the legal details. He takes a di...

Sean W. Bezark focuses his practice primarily on environmental matters for public corporations, privately held companies, banks, lenders, REITs and private equity investment funds. He advises clients on environmental aspects of corporate and real estate transactions, bankruptcy cases, environmental investigations and remediation projects, brownfields development, insurance procurement and risk and cost allocations. He also counsels clients on legal and technical aspects of complex contaminati...

As a partner in the Intellectual Property practice group, Jeff focuses his work on patent litigation and strategic counseling related to pharmaceutical, chemical, biotechnology, electrical engineering, agricultural and food products. A registered patent attorney with four decades of experience, Jeff has successfully represented both patent owners and patent challengers through all stages of federal litigation and appeals. A significant portion of Jeff’s practice includes advising pharma...

Barry A. Chatz is a top attorney recognized by Best Lawyers in the practice area(s) of Bankruptcy and Creditor Debtor Rights / Insolvency and Reorganization Law and Litigation - Bankruptcy. Barry A., 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 Barry A. is held by other top lawyers in the same geographic and legal practice area.

Jeffrey Sheffield concentrates his practice in the areas of tax planning, mergers, acquisitions, and spin-offs, with a particular focus on complex tax planning for publicly traded companies and consolidated groups. Jeff is past Chairman of the Planning Committee for the University of Chicago Federal Tax Institute, and has been listed as a Tier One attorney by Chambers USA. In the 2006–2017 editions of Chambers Global, The World's Leading Lawyers for Business, Jeff is recognized as a lea...

For over 35 years, Amy has been a strategic partner and advisor to her clients. She works closely with her clients to understand their business objectives and challenges and advocates tirelessly on their behalf to achieve their goals. Amy concentrates her practice on commercial real estate and related matters with an emphasis on leasing, construction, acquisitions, and sales. Her practice is national in scope and includes representation of public and private corporations, religious corporatio...