Arian M. June is a litigation partner based in the firm’s Washington, D.C. office and is a member of the White Collar & Regulatory Defense Group. Recognized on Global Investigation Review’s Women in Investigations 2025 list, and by Benchmark Litigation and Chambers USA for her expertise in white collar criminal defense, Ms. June’s practice focuses on independent and board-led investigations, securities enforcement defense, whistleblower matters and crisis management. Ms. June frequently advises audit committees, special board committees and senior management teams on sensitive investigations, including allegations of executive misconduct. She also represents financial institutions, public companies, investment advisers and senior executives in complex regulatory matters.

Ms. June advises clients on various facets of the Dodd-Frank Act, with particular emphasis in designing corporate policies and procedures to comply with the Dodd-Frank Whistleblower regulations, investigating corporate whistleblower reports and mitigating whistleblower-related risks. In addition to her white collar practice, Ms. June also advises boards of corporations, educational institutions and other organizations in sensitive investigations, including board-directed independent inquiries of allegations involving sexual misconduct, racial intolerance and related matters.

Ms. June is ranked as a leading lawyer for White Collar Crime & Government Investigations by Chambers USA (2025), where clients report that she is “extremely strategic and able to stay two steps ahead” and that “her ability to navigate complex legal issues with precision while understanding the business implications is an invaluable skill.” She has previously been described in the guide as “an all-around fantastic lawyer” who is “thoughtful, strategic and very good at client service” with an ability to “get down in the weeds while seeing around corners.” Ms. June was named to Securities Docket’s 2025 Enforcement Elite, a list of “the best securities enforcement defense lawyers in the business.” Additionally, in 2020 Ms. June was Recognized as one of 25 Influential Black Women in Business by The Network Journal.

Ms. June speaks and writes frequently on topics of importance to her practice area. She has authored or co-authored articles for publications such as Bloomberg BNA Securities Regulation & Law Report, Bloomberg BNA World Securities Law Report, Law360, Journal of Investment Compliance and The Hill. Ms. June is co-editor-in-chief of the firm’s Accounting & Financial Reporting Enforcement Round-Up.

Ms. June has served in a variety of professional leadership roles, including as a Fellow to the American Bar Foundation, a Board Member of the District of Columbia Bar Board of Governors, a member of the Board of Trustees for the Washington Lawyers' Committee for Civil Rights and Urban Affairs and Vice Chair for the Federal Regulation of Securities Committee of the American Bar Association Business Law Section. She was also recently appointed to the Board of Directors of the National Health Law Program.

Ms. June joined Debevoise in 2017. She was previously a counsel at an international Washington, D.C.-based firm. She received her J.D. from the University of Pennsylvania Law School, where she served as a senior editor of the University of Pennsylvania Law Review. She earned a B.A. cum laude at the University of Maryland. Ms. June served as a law clerk to Chief Judge Royce C. Lamberth, U.S. District Court for the District of Columbia.

Recent speaking engagements include:

• “In-house Ethics: Pitfalls, Perils, and Practical Tips,” SIFMA C&L 2025 Annual Seminar, March 25, 2025, Austin, TX.
• “Ethical Issues for Governance Lawyers,” PLI’s Corporate Governance – A Master Class 2025, February 24, 2025, New York, NY.
• “SEC Enforcement Investigations,” 52nd Annual Securities Regulation Institute, January 29, 2025, Coronado, CA.
• “Ethical Traps for the Unwary In-House Counsel,” 2023 SIFMA C&L Annual Seminar, March 12-15, 2023, San Diego, CA.
• “Privilege Considerations for Asset Managers,” 6th Annual SEC Alumni, June 23, 2021.
• “Managing Risk in SEC Enforcement Investigations,” Securities Regulation Institute, January 27, 2021.
• “Ethics for Commercial Litigators,” PLI, Ethics for Commercial Litigators, February 18, 2021 and February 20, 2020, New York, NY.
• “Ethics: Lessons Learned from a Silicon Valley Startup,” Securities Regulation Institute, January 29, 2020, Coronado, CA.
• “Trends in Enforcement and Internal Investigations,” Ethics & Compliance Initiative Fellows Conference, January 8, 2020, Washington, D.C.
• Frequent client CLE presentations and senior management training workshops on mitigating corporate whistleblower risks.

Recent publications include:

• “SEC Enforcement Actions Fall Significantly As Crypto and Text Message Cases Predominate,” Securities Docket (November, 2024);
• “Settled Actions Reiterate SEC’s Broad Interpretation of Rule 21F-17(a) Whistleblower Impediments,” Harvard Forum on Corporate Governance (October, 2024);
• “Cooperating with US government investigations: the risks and rewards,” Global Investigations Review (August, 2024);
• “Supreme Court Punches SEC APs Right in the Seventh Amendment,” NYU Compliance & Enforcement Blog (July, 2024);
• “Preparing for AI Whistleblowers,” NYU Compliance & Enforcement Blog (May, 2024);
• “AI Enforcement Starts with Washing: The SEC Charges its First AI Fraud Cases,” NYU Compliance & Enforcement Blog (April, 2024);
• “Debevoise Discusses SEC Whistleblower Action Over Retail Client Agreements,” CLS Blue Sky Blog (February, 2024);
• “Seven Steps to Mitigate Hazing Risks,” NYU Compliance & Enforcement Blog (October, 2023);
• “Key considerations in US government investigations,” Global Investigations Review (August, 2023);
• “The Supreme Court’s Upcoming Affirmative Action Decision: Potential Implications for Private-Sector Employers,” NYU Compliance & Enforcement Blog (June, 2023);
• “Key Considerations in US Government Investigations,” GIR Americas Investigations Review (September, 2022);
• “Debevoise & Plimpton Discusses SEC Enforcement Action Highlighting Whistleblower-Related Rules,” CLS Blue Sky Blog (April, 2022);
• “Government Investigations: Key Considerations in US Government Investigations,” Global Investigations Review: The Americas Investigations Review 2022 (October, 2021);
• “Likely Policy Priorities of the Gensler SEC,” NYU Compliance & Enforcement Blog (April, 2021);
• “Despite Unprecedented Challenges, SEC’s Division of Enforcement’s 2020 Annual Report Presents Healthy Enforcement Results,” Compliance & Enforcement Blog (November, 2020); and
• “5 Ways To Mitigate Whistleblower Risk During COVID-19,” Law360 (July, 2020).