Lanpher, Mark D.

Mark D. Lanpher


Mark Lanpher, partner in the Litigation Group, has extensive experience in securities, white collar, anti-corruption, tax, and regulatory enforcement litigation and advice.  His practice focuses on internal investigations and regulatory enforcement matters involving the Securities and Exchange Commission, the Department of Justice, FINRA, and other Government enforcement agencies.  Mr. Lanpher is based in the firm’s Washington, DC office.

Benchmark Litigation selected Mr. Lanpher for its inaugural “Under 40 Hot List” in 2016 and also recognized him as a “future star” in its 2015 and 2016 editions.

Prior to joining Shearman & Sterling as counsel in 2012, Mr. Lanpher served in a number of government positions, including most recently as Assistant Chief Litigation Counsel in the SEC’s Division of Enforcement in Washington. While at the SEC, Mr. Lanpher played a leadership role in numerous significant SEC enforcement investigations, cases and settlements, including enforcement actions targeting accounting fraud, offering fraud, CDOs, pump-and-dump schemes, and insider trading. In addition, Mr. Lanpher was a member of the SEC’s Cross-Border Working Group and played a key role in investigations and litigations targeting accounting fraud at China-based issuers, addressing the cross-border issues presented by such government investigations.

Before his tenure at the SEC, Mr. Lanpher spent four years as a federal prosecutor in the United States Attorney’s Office for the Southern District of New York. As a federal prosecutor, Mr. Lanpher served as lead prosecutor and trial counsel on a number of high-profile cases, and also argued appeals before the United States Court of Appeals for the Second Circuit. Mr. Lanpher served in the Office’s Organized Crime Unit, where he prosecuted cases under the Racketeer Influenced and Corrupt Organizations Act (“RICO”), and various fraud statutes; he also served as part of the Office’s Mortgage Fraud Task Force, created in the wake of the financial crisis in 2008. For his work as a prosecutor, the United States Attorney General awarded Mr. Lanpher with the John Marshall Award for Trial of Litigation in 2011, and in 2010, Mr. Lanpher was awarded the Federal Law Enforcement Foundation’s Prosecutor of the Year Award.

In addition to his Government service with the Department of Justice and the Securities and Exchange Commission, following law school, Mr. Lanpher spent one year as a law clerk to Chief Judge Edward R. Korman on the United States District Court for the Eastern District of New York, and spent a second year as a law clerk to Judge Reena Raggi on the United States Court of Appeals for the Second Circuit.

Prior to his government service, Mr. Lanpher worked at Shearman & Sterling for two years as a Capital Markets associate in the firm’s Toronto office.

Selected Experience

  • Representing major financial institution in connection with various governmental investigations into accounting irregularities and internal control issues
  • Representing major European financial institution in connection with governmental investigations into potential violations of US sanctions laws
  • Representing CFO of financial institution in SEC investigation of institution’s accounting practices, resulting in closing of investigation with no charges being filed

Selected Publications

  • Co-author, “Broken Windows: SEC’s Controversial Enforcement Philosophy Yields Record Results in 2014,” Bloomberg BNA Securities Regulation & Law Report, 47 SRLR 120, 01/19/2015
  • Co-author, “New SEC Admission Policy May Be Tested Sooner Than Later,” Law360 Expert Analysis, 2013

Speaking Engagements

  • ACI’s 3rd National Forum on Securities Litigation & Enforcement, Panelist, Washington DC, February 2014
  • ACI’s 18th National Forum on D&O Liability, Panelist, New York, NY, October 2014


  • Harvard Law School, J.D., 2003, cum laude
  • Yale University, B.A., 2000, Phi Beta Kappa, magna cum laude



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