In 2000, after 23 years of specializing in criminal defense, Fish & Richardson’s Juanita Brooks switched to patent litigation. Despite having no technical background, she has become a titan of the patent bar. Over the past two years, Brooks has been lead counsel in more than 13 patent trials. She scored an appellate ruling in July 2013 for dialysis machine maker Fresenius USA Inc.—knocking out the remnants of a $150 million infringement verdict won by rival Baxter International Inc. And she fended off generic challenges to Lumigan, Allergan Inc.’s $300 million-per-year glaucoma drug. In that case, a U.S. Court of Appeals for the Federal Circuit panel wrote in 2013 that Brooks “eviscerated” an opposing expert witness’s credibility on cross-examination.