Atty. David C. Mahaffey
David is the managing partner of the Washington, D.C. office, as well as the co-leader of the Investment Management Group. Prior to joining Sullivan & Worcester, David was Special Counsel in the Washington, D.C. office of Gibson, Dunn & Crutcher.
Profile Summary
About David C. Mahaffey at a glance
David C. Mahaffey is a securities attorney based in Washington, District of Columbia, practicing at Sullivan & Worcester LLP. Admitted to practice in District of Columbia, The District of Columbia Bar. Educated at Harvard University (J.D., 1982) and Princeton University (B.A., 1979). Recognitions include Best Lawyers in America — Mutual Funds Law (2026), Best Lawyers in America — Securities Regulation (2026), and Best Lawyers in America — Additional Areas of Practice: (2026). Serands clients in Washington, DC and the surrounding metropolitan area.
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About
- David is the managing partner of the Washington, D.C. office, as well as the co-leader of the Investment Management Group
- Prior to joining Sullivan & Worcester, David was Special Counsel in the Washington, D.C. office of Gibson, Dunn & Crutcher
- He previously served as Assistant General Counsel for Legislation and Investment Company and Adviser Regulation at the Securities and Exchange Commission and as Counsel to SEC Commissioner Aulana Peters
Practice Areas Explained
David C. Mahaffey's Areas of Practice
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David C. Mahaffey is one of 64,529 securities attorneys indexed nationally. Browse securities attorneys in District of Columbia →
Jurisdictional Context
Why local counsel matters in District of Columbia
Practicing law in District of Columbia. Legal matters in District of Columbia are governed by state-specific rules of civil and criminal procedure, statutes of limitations, and substantive law. Cases originating in Washington are typically filed in the local municipal court or the appropriate District of Columbia state district court, depending on subject matter and amount in controversy. An attorney licensed in District of Columbia brings working knowledge of local procedural deadlines, judicial practices in this andnue, and the substantive law that applies to cases brought here. Out-of-state attorneys generally cannot represent clients in District of Columbia courts without local counsel or pro hac vice admission.
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