Gibson, Dunn & Crutcher’s Brian Rosenthal is prominently featured in Bloomberg Law’s Unrivaled 2025 list, recognized for his significant achievements in high-stakes patent litigation. One case that set Rosenthal apart was his defense of Cisco Systems Inc. against Corrigent Corp. in a $350 million damages claim. Notably, he successfully argued for the dismissal of three out of four patents before trial, culminating in a directed verdict of non-infringement by a Texas federal judge, followed by a jury verdict reaffirming non-infringement, invalidity, and prior use in early 2025.
Rosenthal’s strategic approach was defined by simplicity and focus, which were instrumental in securing these outcomes. During the trial, he emphasized that Cisco was the true innovator of the technology in question. His trial strategy involved narrowing down arguments to their most critical elements and ensuring consistent messaging. This was particularly effective as Judge Albright, who presided over the case, had only previously issued two directed verdicts of non-infringement, both of which Rosenthal had also led.
A key challenge in the trial was conveying complex technical distinctions to the jury, notably the difference between “physical” and “virtual” ports in a computer network device. Rosenthal effectively overcame this by incorporating a large Cisco device as a visual aid throughout the trial proceedings. This hands-on demonstration turned a potential obstacle into a compelling argument, ultimately aligning the jury with Cisco’s position.
Reflecting on his career path, Rosenthal recounts his childhood admiration for the iconic television lawyer Perry Mason, which inspired his pursuit of trial law. Originally pursuing computer science, he transitioned to law to align his competitive spirit with his professional life. Rosenthal emphasizes the importance of finding a simple narrative and maintaining credibility in court, which he considers essential for winning over judges and juries.
For aspiring trial lawyers, Rosenthal’s advice centers on authenticity and self-discovery, encouraging young lawyers to develop their own voice rather than emulating others. His story and insights underscore the combination of strategic acumen, technical clarity, and personal integrity that define success in complex litigation. For further details, see the full article on Bloomberg Law.