Leading appellate litigator Allyson Ho today joined Gibson, Dunn & Crutcher as a partner in its Dallas office after nearly 10 years as a partner at Morgan, Lewis & Bockius, also in Dallas.

A former clerk to U.S. Supreme Court Justice Sandra Day O’Connor, Ho has argued four cases before the high court—including, most recently, in the key patent case Oil States Energy Services v. Greene’s Energy Group, decided in April. In the 2014 term, she was the only woman in private practice to appear more than once before the justices, arguing two cases in the span of 21 days.