Mark Filip, a former federal judge and high-ranking Justice Department official, helps to lead Kirkland’s government enforcement defense and internal investigations group, and serves as a member of the Firm’s Executive Committee. As a partner in the Firm’s Chicago and Washington, D.C., offices, Mark has successfully guided numerous Fortune 100 companies and financial institutions through complex mission-critical moments, counseling leaders and Boards of Directors on high-stakes matters at the intersection of litigation, public policy, and reputation. He is a fellow in the American College of Trial Lawyers.

Mark has deep experience in both private practice and in government service, having served as a federal judge for the Northern District of Illinois and at the highest levels of government, including as Deputy Attorney General of the United States. Among various Fortune 100 companies and financial institutions, his clients span across a broad array of industries including healthcare, energy, defense contracting, manufacturing, media, professional sports, mining, agricultural production and gaming.

In his public representations, Mark has helped many of the world’s leading businesses resolve significant disputes with government authorities, including: 

  • BP, in relation to the Deepwater Horizon explosion and oil spill;
  • Goldman Sachs, in relation to its Malaysian 1MDB bond offerings;
  • Boeing, in relation to allegations concerning its 737 Max airplane;
  • J.P. Morgan Chase, in relation to allegations of market manipulation and “spoofing”; and
  • GM, in relation to allegations regarding ignition switches in its automobiles.

Mark has represented well-known individuals and major corporations, and has successfully resolved disputes with government authorities including: the Department of Justice; Securities and Exchange Commission; Federal Trade Commission; Department of Labor; Environmental Protection Agency; Department of Defense; Department of Homeland Security; Congress; Federal Reserve; New York Department of Financial Services; state attorneys general; and foreign regulators.

Many of Mark’s representations involve “crisis management” situations with substantial media, congressional, law enforcement, and regulatory scrutiny, as well as related civil litigation. Mark’s practice also includes a broad securities practice for clients in a variety of industries.

Mark also leads internal investigations for a wide array of boards and companies, across industries, issues ranging from financial and accounting practices to #metoo allegations, and countries around the world. He has also represented numerous special board committees convened in response to shareholder demands.

Mark has an active civil practice, including particularly in the area of class action defense. For example, he represents Allergan in expansive class action and Multi-District Litigation (MDL) litigation concerning its manufacture and sale of opioid products. Mark has substantial experience with the federal MDL process, and he has served as a judge in class action matters during his tenure on the federal bench, and as an advocate in such cases in private practice.

Prior to joining Kirkland, Mark worked at the U.S. Department of Justice, where he served as Deputy Attorney General of the United States after being unanimously confirmed by the U.S. Senate. As Deputy Attorney General, Mark was second-in-command of the Justice Department and oversaw all of its criminal and civil enforcement efforts. He also represented the Justice Department in its interactions with Congress, the White House, other cabinet-level Departments, and numerous foreign governments. Mark served as Acting Attorney General after the inauguration of President Obama, until U.S. Attorney General Eric Holder was confirmed.

Prior to serving as Deputy Attorney General, Mark spent four years as a federal judge on the U.S. District Court for the Northern District of Illinois after being confirmed 96–0 by the U.S. Senate. During his time as a trial judge in Chicago, Mark presided over a full docket of federal cases, including lawsuits concerning intellectual property disputes, securities law, criminal law, antitrust issues, employment and sexual harassment laws, and a wide variety of commercial and property disputes.

Early in his career, Mark served as an Assistant U.S. Attorney in Chicago, where he prosecuted a variety of criminal cases, including political, judicial, and police corruption, and financial and tax fraud.



Fellow, American College of Trial Lawyers

Named to The Best Lawyers in America, U.S. News and World Report, Best Lawyers® for Bet-the-Company Litigation, Commercial Litigation, Criminal Defense: White Collar and Litigation - Securities through anonymous peer recommendation and review process (2011–2024)

Recognized as a “Litigation Star” by Benchmark Litigation (2012–2024) 

Chambers Global for Foreign Corrupt Practices Act (USA) (2016–2024) 

Recognized in Lawdragon’s “500 Leading Litigators” (2024)

Chambers Crisis & Risk Management for Crisis Management (2023)

Chambers USA for Litigation: General Commercial (2011–2023); White-Collar Crime & Government Investigations (2012–2023); and Foreign Corrupt Practices Act (2015–2023)

Listed as a “Leading Lawyer” in the areas of General Commercial Disputes, White-Collar Criminal Defense and Securities Litigation: Defense in The Legal 500 U.S. and recognized for Securities: Litigation – Defense (2014–2023); for White-Collar Criminal Defense (2012–2023); for General Commercial Disputes (2015–2023); for Financial Services Litigation (2018–2023); for Product Liability, Mass Tort and Class Action: Consumer Products (including Tobacco) (2023); for Government – State Attorneys General (2023)

Named the Best Lawyers "Lawyer of the Year" for Bet-the-Company Litigation; for Criminal Defense – White-Collar; and for Litigation – Securities 

Named a “Top FCPA Practitioner,” Global Investigations Review (2021)

Recognized in Crain’s Chicago Business’ list of “Notable Gen X Leaders in Law” (2019) 

Named a “Client Service All-Star” by BTI Consulting Group (2019) 

Honored by Martindale-Hubbell with the AV Preeminent™ award for The Highest Possible Ranking in Both Legal Ability & Ethical Standards (fifteen years in a row)


Chicago Legal Aid Bureau's 2008 William H. Avery Award for Commitment to Pro Bono Legal Work and Public and Community Service

Memberships & Affiliations

Served as one of four members of bi-partisan U.S. Secret Service Protective Mission Panel convened by the Obama Administration. The Panel reported to Congress and the White House concerning its recommendations to improve the U.S. Secret Service’s performance and capability to protect the White House and President.

Served as a member of U.S. Judicial Conference's Advisory Committee on Federal Criminal Rules

Chairman Emeritus, Board of Directors, University of Illinois Alumni Association

Member, Board of Visitors, Duke University School of Law


Admissions & Qualifications

  • 2010District of Columbia
  • 1995Illinois


  • Harvard Law SchoolJ.D.magna cum laude1992

    Editor, Harvard Law Review

    Sears Prize Winner

  • University of OxfordB.A., Jurisprudence1990

    First Class Honors

    Marshall Scholarship Recipient

  • University of Illinois at Urbana-ChampaignB.A., Economics & Historysumma cum laude1988
    Student Member, University Board of Trustees

Other Distinctions

Holder of various high-level security clearances