Christina Thomas is a partner in Mayer Brown’s Washington DC and New York offices and a member of the Capital Markets practice. Christina represents US and foreign companies, investment banks and sponsors on securities offerings, mergers and acquisitions, US Securities and Exchange Commission (SEC) disclosure requirements, shareholder proposals, and ESG matters.

Christina is a former senior advisor at the SEC, serving most recently as Counsel to SEC Commissioner Elad L. Roisman. In that role, she provided legal counsel to the Commissioner on his consideration of policy, regulatory, and enforcement matters.

She advised on SEC proposed and final rule amendments, interpretations, and guidance relating to, among other things, public company disclosure, the proxy voting process, and capital formation. Christina advised on major rulemakings, including modernization of Regulation S-K disclosure requirements, the update of statistical disclosures for bank and savings and loan registrants, amendments to financial disclosure requirements for acquired and disposed businesses, exemptions from the proxy rules for proxy voting advice, amendments to the shareholder proposal rule, extension of the “test-the-waters” accommodation to all issuers, amendments to the “accredited investor” definition, and harmonization of the exempt offering framework.

She also served as lead advisor on international securities law and policy. Prior to serving as counsel to the Commissioner, Christina was detailed to the US Department of the Treasury to advise on international securities law matters. She received the Secretary’s Honor Award in recognition of her contributions. Christina began her career at the SEC in its Division of Corporation Finance in the Office of Healthcare and Insurance (now Life Sciences). She also served as a reviewer on the SEC’s Shareholder Proposal Task Force and in the Office of Mergers and Acquisitions.


New York Law School, JD, magna cum laude
New York Law School Law Review

Fordham University, BA, Classical Languages


  • District of Columbia
  • New York


  • US Supreme Court