Brent I. Clark

Tom represents clients in patent and trademark prosecution, intellectual property litigation, and post-grant patent challenges before the Patent Trial and Appeal Board (PTAB). Tom has a broad base of experience in various technological and business areas, particularly in pharmaceutical, biotechnology, chemical and medical device inventions. He drafts invalidity opinions, investigates freedom to operate, counsels on strategic portfolio management, and conducts due diligence investigations prio...

Chair of the firm’s Associations and Foundations group, Paula Goedert represents nonprofit organizations, including professional societies, trade associations, public charities and private foundations. Paula offers a depth of experience in guiding nonprofits through the challenges they face, and appreciates the opportunity to help make a difference. Paula serves as general or lead counsel for many national associations that represent prominent economy-drivers, industries and professiona...

Lawrence Levin primarily represents public companies, private companies and investment banks on a wide range of regulatory, transactional and general corporate matters. He is the co-head of Katten's Corporate Securities practice in Chicago. Larry primarily advises publicly traded issuers on day-to-day federal securities law disclosure and compliance matters and board corporate governance. He also represents issuers and underwriters in offerings of equity, debt, Rule 144A high-yield offerings ...

Sean M. Houlihan is a top attorney recognized by Best Lawyers in the practice area(s) of Aviation Law, Medical Malpractice Law - Plaintiffs, Personal Injury Litigation - Plaintiffs and Product Liability Litigation - Plaintiffs. Sean M., 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 Sean M. is held by other top lawyers in the same geographic and legal practice area.

Chad Vance is a top attorney recognized by Best Lawyers in the practice area(s) of Litigation - Insurance and Reinsurance Law. Chad, 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 Chad is held by other top lawyers in the same geographic and legal practice area.

ATTORNEY FOR PRODUCT LIABILITY AND AVIATION LAW Richard Burke is a partner at Clifford Law Offices. He is an outstanding product liability attorney and one of the most respected aviation liability attorneys in Chicago. Mr. Burke is experienced in many complex practice areas including medical malpractice, nursing home negligence, heavy truck litigation, product liability, aviation liability, aviation litigation, airline liability, and other forms of transportation liability. Over his decades o...

Mark Hagedorn advises on a wide variety of intellectual property matters, including patent, trademark and copyright solicitation and IP litigation, licensing and counseling. Appreciated for his honesty and practical legal advice, Mark consistently delivers utilitarian solutions that help his clients resolve disputes and litigation efficiently and economically. Mark offers broad experience in virtually all phases of IP counseling and litigation. He understands and has represented clients invol...

Marc H. Trachtenberg is a top attorney recognized by Best Lawyers in the practice area(s) of Advertising Law and Trademark Law. Marc H., who practices law in Chicago, Illinois, has been recognized since 2020. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Marc H. is held by other top lawyers in the same geographic and legal practice area.

Keith H. Berk is a top attorney recognized by Best Lawyers in the practice area(s) of Corporate Law. Keith H., who practices law in Chicago, Illinois, has been recognized since 2024. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Keith H. is held by other top lawyers in the same geographic and legal practice area.

Jeffrey Patt is a top attorney recognized by Best Lawyers in the practice area(s) of Corporate Law and Venture Capital Law. Jeffrey, 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 is held by other top lawyers in the same geographic and legal practice area.