DLA Piper’s star co-head of mass tort and class actions Amy Schulman has left the firm to join Pfizer as general counsel and senior vice president, it was announced Wednesday.

Schulman is renowned as one of the top litigators in the U.S. after a Harvard Business School case study in 2006 claimed that she was responsible for a $60 million book of business. Schulman is also believed to have been DLA Piper’s highest-paid partner in 2006, earning $5.75 million according to Legal Week‘s U.S. sister title The American Lawyer.