WASHINGTON, DC—September 28, 2026—O’Melveny announced today that David Leviss, a veteran litigator and former senior federal government official, has rejoined the firm’s Washington, DC office as a partner in the Health Care Practice Group and on the Congressional Investigations team. He will represent and advise health care organizations, corporations, boards of directors, and executives in navigating complex government and internal investigations, False Claims Act (FCA) matters, and high-stakes congressional inquiries.
With more than 25 years of experience spanning private practice and distinguished public service, Leviss brings a rare combination of expertise from his work at the US Securities and Exchange Commission (SEC), the US Department of Justice (DOJ), and the US House of Representatives. Most recently, he served as the SEC’s first Associate General Counsel for Oversight and Investigations, where he built and led the agency’s Oversight & Investigations Group. In that role, he was the principal legal adviser on all government oversight matters and prepared senior officials—including the SEC chair and division directors—for congressional testimony.
Before his recent government service, Leviss spent 11 years at O’Melveny. He joined the firm in 2011 as special counsel and was promoted to partner in 2013. During his initial O’Melveny tenure, he helped develop the firm’s leading FCA and health care enforcement teams and co-chaired the firm’s Congressional Investigations group. Earlier in his career, Leviss served the US House of Representatives as Chief Oversight Counsel to the Energy & Commerce Committee and Senior Investigative Counsel to the Committee on Oversight and Government Reform. In those roles, he planned, supervised, and executed oversight and fraud investigations, and directed numerous high-profile public hearings. He also spent seven years as a trial attorney in the DOJ’s Civil Fraud section, where he investigated and litigated complex FCA cases—including those involving allegations of improper health care reimbursement under Medicare and Medicaid.
“We are delighted to welcome Dave back to O’Melveny,” said O’Melveny chair Bradley J. Butwin. “His exceptional experience at the SEC, DOJ, and on Capitol Hill—along with his proven track record as a partner at our firm—makes him uniquely positioned to guide our clients through an increasingly challenging and uncertain regulatory landscape. Dave’s return strengthens our nationally recognized Health Care Practice and our stellar Congressional Investigations team at a pivotal time for our clients.”
“I am thrilled to come ‘home’ to O’Melveny,” said Leviss. “This is an incredible opportunity to rejoin the firm where I spent so many wonderful years and to practice alongside outstanding colleagues I know and respect. With its health care prowess, collaborative culture, and deep Washington legacy, O’Melveny is again the ideal platform for me to help clients successfully manage high-profile government investigations and enforcement matters presenting enterprise-wide challenges. I look forward to contributing to the firm’s continued growth in these critical areas.”
With Leviss’s arrival, 58 lateral partners have joined O’Melveny since 2023. And he is the third partner to join the firm’s Health Care Practice since 2025, following the May 2025 arrival of lateral partner Kevin Barstow and the January 2026 promotion of partner Anne Steinberg.
Leviss earned his J.D. from New York University School of Law and his B.A. from Amherst College.
