Marc P. Seidler

John O’Neil’s legal knowledge, business savvy, and leadership of complex transactions have earned him a reputation as a global leader in private equity fund matters. John heads the Investment Funds Practice Group, the Firm’s leading-edge global platform that provides innovative and bespoke legal strategies to sponsors and funds of all kinds. John is also a member of the Firm's Executive Committee. John has been recognized by Chamber’s Global, Chambers USA, IFLR 1000, L...

Former chair of the firm’s International Arbitration Practice, Ricardo applies his multilingual capabilities to advise clients in international arbitrations and lawsuits filed across the world, including in the U.S., Asia, Latin America, the Middle East, and Europe. Ricardo has nearly 30 years of litigation and international arbitration experience. His practice is focused on high-stakes international commercial arbitration as well as investment treaty arbitration for clients in a wide v...

For the past two decades, Mike has been assisting clients develop and defend their patent portfolios. A former Army officer and Ford Motor Company design engineer, clients appreciate Mike’s organized approach to problems and his ability to communicate with inventors across a wide swath of technologies. Mike is a full spectrum patent attorney and is himself a patentee. On the prosecution side, Mike has procured patents in nearly every art group other than bio/pharma and has an almost per...

Matthew J. Richards is a lawyer recognized by Best Lawyers in the practice area of Leveraged Buyouts and Private Equity Law. Matthew J. practices law in Chicago, Illinois Best Lawyers has recognized Matthew J. Richards since 2015. 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 Matthew J. Richards is held by other lawyers.

Ziemowit T. Smulkowski is a lawyer recognized by Best Lawyers in the practice area of Tax Law. Ziemowit T. practices law in Chicago, Illinois Best Lawyers has recognized Ziemowit T. Smulkowski 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 Ziemowit T. Smulkowski is held by other lawyers.

Joseph E. Tilson is Co-Chair of Cozen O'Connor's Labor & Employment Department and a member of the Management Committee and Board of Directors. Joe represents employers in large-scale employment litigation and labor arbitrations. In the past 35 years, he has tried more than 150 jury and non-jury cases before the full range of courts, administrative agencies and labor arbitrators. His clients include a number of the country’s largest public and private employers, and Illinois’ ...

David K. Haase has extensive experience representing employers in all aspects of labor and employment law. He has particular expertise in litigating wage and hour class/collective actions, unfair competition claims, such as non-competition agreements and trade secrets, and employee benefits litigation. David has litigated the full panoply of employment-related matters before the federal and state courts. David is the chair of Littler’s Pro Bono Committee. He publishes frequently and lec...

Kristian Werling is a lawyer recognized by Best Lawyers in the practice area of Health Care Law. Kristian practices law in Chicago, Illinois Best Lawyers has recognized Kristian Werling 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 Kristian Werling is held by other lawyers.

Kevin Conway is a trial lawyer involved in mass torts and catastrophic injury cases. He is known throughout the United States. He is a named partner at Cooney and Conway based in Chicago, Illinois. He is a Past President of the Illinois Trial Lawyers Association . He is the recipient of the Leonard Ring Award for his significant contributions to victim's rights at trial and for advocating for the public's Right to Trial by Jury. He has been recognized by numerous local and national organizati...

Steven H. Klein is a lawyer recognized by Best Lawyers in the practice area of Family Law. Steven H. practices law in Bannockburn, Illinois Best Lawyers has recognized Steven H. Klein since 2020. 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 Steven H. Klein is held by other lawyers.