Antitrust lawyers

Katharine O'Connor

Katharine (Kate) O’Connor focuses her practice on complex antitrust litigation, antitrust investigations brought by the US antitrust regulators and state attorneys general, and counseling clients on antitrust compliance questions. Kate also regularly represents clients before the antitrust regulators related to mergers and acquisitions. Kate has experience representing clients in a wide array of industries, including healthcare, manufacturing, food and finance. Kate is a member of the firm’s antitrust and competition practice, which Global Competition Review has designated a “Global Elite” and “Illinois Elite” practice. She has been recognized by Global Competition Review, Benchmark Litigation, Legal 500 US and Super Lawyers as excelling in the field of antitrust. Kate has tried cases before juries, judges and arbitration panels, presented evidentiary hearings in federal and administrative courts and argued before the US Court of Appeals for the Seventh Circuit, federal district courts and state courts. She is a member of the Northern District of Illinois Trial Bar. While in law school, Kate was the managing articles editor of the University of Illinois Law Review and a legal extern to Magistrate Judge David G. Bernthal of the US District Court for the Central District of Illinois.

McDermott Will & Schulte

Katherine B. Forrest

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Paul, Weiss, Rifkind, Wharton & Garrison LLP

Katherine Helm

Partner

Dechert

Katherine Katz

Katherine Katz is a partner in the Washington, D.C., office. Her practice includes a broad range of complex commercial litigation and class action matters in federal and state courts. Katherine has represented clients in litigation matters involving a wide range of practice areas including products liability, antitrust and commercial disputes. In addition to litigation matters, Katherine represents and advises companies faced with investigations and enforcement actions brought by the U.S. Department of Justice and State Attorneys General.

Kirkland & Ellis LLP

Katherine Rocco

Katherine (Kate) Rocco is the Co-Chair of Latham’s New York Litigation & Trial Department and is a partner in the firm’s Antitrust & Competition Practice. Kate is a nationally recognized leader in the antitrust bar who regularly leads clients through their most complex antitrust matters, including by securing clearances from the Department of Justice (DOJ) and the Federal Trade Commission (FTC) for high-stakes mergers, and defending companies in a wide range of antitrust litigations, investigations, and criminal cartel matters. In her practice spanning nearly two decades, Kate has advised private and public companies on more than US$200 billion worth of transactions and hundreds of individual matters. She has litigated multiple matters through trial and appeal and appeared before numerous agencies including the European Commission. Kate’s broad industry experience encompasses semiconductors, consumer products, life sciences, sports, entertainment, social media, healthcare, financial services, agriculture, and technology. Kate currently serves on the board of the Legal Aid Society and has an active pro bono practice. For nearly a decade, Kate served on the Civil Rights Committee of the New York City Bar Association, including by serving as an independent legal observer at the Guantanamo Bay military tribunals in Cuba in 2012 and 2014, and by preparing amicus briefs for the Supreme Court of the United States on issues like warrantless wiretapping. During law school, Kate was an editor for the Fordham Law Review and interned for Judge Shira A. Scheindlin (SDNY). She was the recipient of a Fulbright Scholarship in 2005 (Malaysia) and served as an intern at The White House in 2002.

Latham & Watkins

Kathy O\'Neill

Kathy O’Neill is a partner in Fried Frank’s Antitrust and Competition Department. Kathy focuses on clearance of mergers, acquisitions and joint ventures, as well as investigations and litigation under federal and state antitrust laws, and antitrust compliance counseling and training. Kathy previously served nearly 16 years in the Department of Justice (DOJ)’s Antitrust Division. While at DOJ, Kathy served as the senior-most career official overseeing all civil antitrust enforcement. She previously served as chief of the Antitrust Division’s Transportation, Energy and Agriculture Section, and as a trial attorney in the Telecommunications and Media Section. During her tenure, Kathy played a leading role in advancing numerous high stakes antitrust investigations and litigations across a wide range of industries including agriculture, airlines and aerospace, banking, communications, energy, media and entertainment and technology, among many others. Her more than 20 years of government experience also includes roles as assistant attorney general for the New York Attorney General’s Office and as an attorney advisor at the Federal Communications Commission.

Fried, Frank, Harris, Shriver & Jacobson LLP

Katrin Schallenberg

Katrin Schallenberg's practice focuses on European and French antitrust and merger control. She advises clients across multiple sectors with a focus on tech, energy, and large industrials. Katrin splits her time between Paris and Brussels.

Clifford Chance

Keith E. Smith

Shareholder

Greenberg Traurig

Keith Hummel

Keith R. Hummel is a member of the Litigation Department and Co‑Chair of the Intellectual Property Practice. He has extensive experience litigating complex commercial, intellectual property and antitrust disputes for plaintiffs and defendants in diverse fields, including biotechnology, pharmaceuticals, medical devices, home automation, computer hardware and software, telecommunications, coating systems, and wine and spirits. Known as an “excellent trial lawyer” and praised as “ingenious, resourceful, resolute and unflagging—there is nothing he cannot do when it comes to complex legal conflict,” Mr. Hummel is consistently recognized as one of the country’s leading practitioners in the intellectual property arena, particularly in critical multi‑jurisdictional patent disputes. (Chambers USA; IAM Patent)

Cravath, Swaine & Moore LLP

Keith Klovers

Keith Klovers, former advisor to FTC commissioners Christine S. Wilson and Maureen K. Ohlhausen, represents companies in complex merger reviews, government conduct investigations, and civil antitrust litigation, as well as in complaints brought by US antitrust enforcers. Keith represents companies in highly scrutinized industries, including healthcare, life sciences, and technology, before the US DOJ and FTC. He leverages an impressive track record of successfully obtaining merger clearances, including unconditional clearances without remedies for high-profile mergers, resolving conduct investigations, and defending clients in antitrust litigation and on appeal before the US government. Complementing his extensive experience advising clients on day-to-day antitrust issues, he has provided specific guidance to clients related to the antitrust considerations of IP licensing, Robinson-Patman Act compliance, and dual distribution arrangements. During his tenure at the FTC, Keith advised the commissioners on more than 100 merger reviews and conduct investigations, including litigation, settlements, and Part 3 opinions, and advised on several significant antitrust policy initiatives. Keith also clerked for judge Douglas H. Ginsburg on the US Court of Appeals for the District of Columbia Circuit. A prolific writer on current and innovative antitrust trends, his numerous articles can be found in the Antitrust Law Journal, Michigan Law Review, George Mason Law Review, Journal of Antitrust Enforcement, Antitrust Magazine, Health Affairs, and the Journal of Economic and Development Studies, among others.

Latham & Watkins

Kelly Fayne

Kelly Fayne guides many of the world’s most innovative companies through the evolving global antitrust landscape to advance their strategic objectives. One of the sharpest economics minds in the antitrust bar, Kelly leverages data and cutting-edge economics to craft winning strategies for companies at the forefront of technology and innovation. She guides companies at the forefront on: Global deal clearance strategies for their global M&A Antitrust litigation, including merger defense Antitrust compliance and counseling Government conduct investigations before antitrust regulators in the US, EU, UK, Australia, and across Asia and Latin America She represents clients from a wide range of industries and helps them navigate the strategic risk calculus unique to highly scrutinized sectors. Kelly also helps clients distill complex antitrust economic analysis and econometrics into persuasive arguments, including related to Web3 and AI technology. A recognized leader in the industry and within the firm, actively participates in the ABA Antitrust Law Section, for which she frequently writes and speaks on a range of antitrust issues and serves as Vice Chair of the Economics Committee. She has also served as senior editor of the ABA Antitrust Law Section’s Antitrust Law Journal. Kelly is a local leader of Latham's Bay Area WEB Committee. Before law school, Kelly was an analyst at a major economic consulting firm, where she supported expert economists in antitrust and intellectual property matters.

Latham & Watkins

Keltoum Boudribila

Keltoum Boudribila joined Baker McKenzie in September 2012 and works on a daily basis on operations led by the Casablanca office, the 71st office of the network and third site of Baker McKenzie in Africa.

Baker & McKenzie Maroc

Kenina Lee

Counsel

Axinn Veltrop & Harkrider

Kenneth A. Gallo

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Paul, Weiss, Rifkind, Wharton & Garrison LLP

Kenneth Costello

Senior Counsel - Corporate and Finance Transactions

Bryan Cave Leighton Paisner

Kenneth M. Minesinger

Shareholder

Greenberg Traurig

Kenneth Reinker

Kenneth S. Reinker’s practice as a Partner at the firm focuses on all aspects of antitrust law, including litigation, government investigations, and merger review. Ken’s practice spans all industries, including extensive experience in pharmaceuticals, medical devices, and health care; high-technology industries; media; and financial institutions. Ken has particular experience in the application of economics to legal matters and in working with economic experts. In addition to appearing before U.S. courts and regulators, he has had in-depth involvement with China’s Ministry of Commerce (MOFCOM) and other global regulators.

Cleary Gottlieb Steen & Hamilton

Kenneth Steinthal

Partner

King & Spalding

Kerrin Slattery

With a diverse transaction practice focused on hospitals, health systems, investors and other healthcare industry participants throughout the country, Kerrin B. Slattery has earned a reputation for excellence. Her significant experience across a wide range of health industry transactions, including mergers, acquisitions, affiliations, joint ventures and system restructurings involving nonprofit hospitals and health systems, academic medical centers, post-acute providers, large medical groups and their investors, makes her a valuable partner to healthcare leaders working to implement strategy, drive innovation and operate in a highly-regulated and rapidly evolving landscape. Kerrin manages large-scale transactions, frequently leading teams of experienced practitioners with unique health industry knowledge, such as antitrust, employee benefits, environmental, executive compensation, privacy and security, digital health, real estate, fraud and abuse, and white collar. In addition, Kerrin regularly instructs clients on corporate and regulatory compliance matters, including state and federal regulations uniquely applicable to healthcare entities. She also works with numerous Catholic healthcare organizations and non-Catholic organizations in the unique structuring and operation issues related to the intersection of corporate and Canon laws governing Catholic sponsored entities. Kerrin is also a respected member of the leadership team at McDermott. She currently serves on the management committee and previously held the role of partner-in-charge of the Firm’s Chicago Health Industry Advisory Group. Kerrin was also an adjunct professor of law at Loyola University Chicago School of Law. Kerrin is a practice area leader for the hospitals and health systems practice.

McDermott Will & Schulte

Kerry Donovan

Winston Taylor

Kevin Adam

Partner

White & Case LLP

Kevin Arquit

Quinn Emanuel Urquhart & Sullivan, LLP

Kevin Goldstein

Winston Taylor

Kevin J. O'Brien

Partner

Alto Litigation