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Who's Who Legal
Who's Who Legal

Global Leader

Investigations 2021

Professional Biography

WWL Ranking: Recommended

Peers and clients say:

"Jason deserves inclusion on a list of leading lawyers"
"An excellent choice for corporate investigations"


Jason S. Lewis is a Partner in the Litigation and Regulatory Section of DLA Piper (US), primarily practicing out of the Dallas office. Jason is a trial attorney who handles civil and criminal regulatory investigations and litigation matters across the Unites States and internationally.  Jason received his BA, with distinction, from the University of Oklahoma in 1995 and his JD, with a Concentration in Business Law and Regulation, from Cornell Law School in 1998.

Jason, a former senior enforcement attorney with the US Securities & Exchange Commission (SEC), focuses his practice on SEC enforcement, government investigations, conducting internal corporate investigations, FCPA matters, white collar criminal defense, healthcare fraud, crisis management, securities litigation, and business disputes. Jason has been recognized by several organizations and publications as a top securities enforcement and white collar attorney.  In addition to conducting government and internal investigations, Jason has been the lead attorney in federal jury trials brought by the Department of Justice (DOJ) and the SEC. Jason routinely handles high-profile and high-stakes matters. Chambers USA described Jason as possessing "…an excellent reputation for his broad white-collar practice, representing corporations and individuals in civil and criminal regulatory investigations and litigation matters" and is noted for being "very strong on SEC investigations."

Jason has defended and regularly represents corporate entities, officers, directors, and individuals in civil and criminal investigations and litigation involving the SEC, DOJ, the Financial Industry Regulatory Authority (FINRA), Federal Trade Commission (FTC), Internal Revenue Service (IRS), Department of Treasury's Office of Foreign Assets Control (OFAC), state securities boards and attorney general offices, as well as numerous other state and federal governmental agencies. He also represents public companies and their officers and directors in securities class actions, derivative actions, state and federal litigation and arbitrations.

Jason has handled and successfully defended numerous high-profile and high-stakes SEC enforcement investigations and litigation. Jason interacts with the SEC staff on nearly a daily basis and has defended matters arising from every SEC Regional Office and the SEC's Home Office in Washington, DC. During his tenure at the SEC, Jason conducted numerous investigations, including accounting fraud, insider trading, market manipulation, offering fraud, reporting and disclosure violations and auditor misconduct. Jason also defends entities and individuals in criminal investigations both pre and post indictment. Jason routinely deals with Main Justice in Washington, DC and local US Attorney Offices. Jason has conducted a broad range of internal investigations working closely with company internal counsel, special committees and audit committees to effectively and efficiently define the scope of the investigation and provide findings. Jason’s investigative experience includes accounting irregularities, FCPA issues, export controls and sanctions, insider trading, AML, public corruption, bank fraud, healthcare fraud and employee malfeasance. In addition, Jason advises clients on corporate governance and compliance matters.
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