HOUSTON—March 30, 2026—O’Melveny announced today that experienced capital markets lawyer and trusted corporate adviser Douglas C. Lionberger has joined the firm’s Houston office as a partner in the Capital Markets Practice, bolstering the team’s Texas capabilities and expanding its formidable nationwide roster of leading corporate practitioners.
Lionberger brings more than 15 years of experience advising clients on their most significant transactions and complex corporate matters. He represents both issuers and underwriters in public offerings, including traditional IPOs, follow-on offerings, and de-SPAC transactions. He also advises on M&A deals, private equity transactions, and securities law matters. The Legal 500 US has recognized Lionberger as one of the nation’s top corporate lawyers, and his work spans a range of industries that align with O’Melveny’s strengths, including energy, transportation, infrastructure, and technology.
Lionberger comes to O’Melveny from the Houston office of Holland & Knight, where he was a partner in several of that firm’s practices, including Corporate Services, Public Companies & Securities, Mergers & Acquisitions, Private Equity, and Energy. His arrival accelerates O’Melveny’s rapid expansion in the Lone Star State. He is the sixth lateral partner to join the firm’s Houston office in two years. And since 2021, O’Melveny has added 90 lawyers—including 32 partners—across its offices in Houston, Dallas, and Austin.
“Doug is a fantastic addition to our fast-growing Houston office and to our talented Capital Markets team,” said O’Melveny chair Bradley J. Butwin. “Our clients in Texas and beyond will benefit from Doug’s deep experience and versatility across capital markets and M&A transactions, especially in the energy and transportation sectors. It is a pleasure to welcome him to O’Melveny.”
“I’m delighted to join O’Melveny and excited to be part of the firm’s rapid expansion in Houston,” said Lionberger. “I was drawn to the firm’s broad platform, sterling reputation, and collaborative approach to client service. I’m looking forward to working alongside O’Melveny’s top-notch Capital Markets lawyers, and to making this firm my professional home for years to come.”
The addition of Lionberger further propels O’Melveny’s continued strategic growth. He is the fourth lateral partner to join the firm’s Capital Markets team in the past year—following the arrivals of Houston partner James R. Brown earlier in March and New York partners Andra Troy and David Ni in 2025. And Lionberger is the 48th lateral partner to join O’Melveny since 2023, including 29 corporate partners.
Lionberger earned his J.D. from the University of California, Berkeley School of Law and his B.A. from Texas A&M University.
About O’Melveny
It’s more than what you do: it’s how you do it. Across sectors and borders, in board rooms and courtrooms, we measure our success by yours. And in our interactions, we commit to making your O’Melveny experience as satisfying as the outcomes we help you achieve. Our greatest accomplishment is ensuring that you never have to choose between premier lawyering and exceptional service. So, tell us. What do you want to achieve? Visit us at www.omm.com; learn more in our firm at-a-glance; and find us on LinkedIn, Facebook, Instagram, and YouTube.
