Returning to the firm where she began her legal career, Lisa Blatt is leaving Arnold & Porter to rejoin Williams & Connolly, where she will head the firm’s Supreme Court and appellate practice.

Blatt has argued 37 cases before the U.S. Supreme Court—more than any other woman—and won 33 of them (two are pending). Her Feb. 5 move to Williams & Connolly comes as the firm’s current appellate practice head, Kannon Shanmugam, decamps to Paul Weiss, Rifkind, Wharton & Garrison, creating an opening for a new appellate leader at the Washington, D.C.-based litigation firm.