Constance Ramos, who left Winston & Strawn in August to start her own Oakland, California-based intellectual property boutique, has become the latest former member of Big Law to bring a gender bias suit against an Am Law 200 firm.

The litigation, which has not yet been previously reported, began with a 19-page complaint filed on Aug. 30 against Winston & Strawn in San Francisco County Superior Court. Ramos' suit accuses the firm of sexual discrimination and retaliation in its treatment of her after she was asked to leave its partnership in early 2016.

Ramos is a former Honolulu high school classmate of President Barack Obama, who made pay equity a cause célèbre of his outgoing administration. In 2008, Ramos co-edited a self-published book chronicling some of her classmates' recollections about their time with the future U.S. president.