"Powell Gilbert LLP is a breakaway firm formed by five partners from Bristows including the firm's former head of pharmaceuticals and biotechnology Penny Gilbert, and the head of its pharmaceutical regulatory group, Tim Powell. They brought some major life sciences clients with them and have also been acting for Yeda, the technology transfer arm of the Israel-based Weizmann Institute, in a major patent entitlement action relating to antibody therapy for cancer. The firm additionally has a significant medical devices practise, and Zoë Butler is well regarded for life sciences disputes. Clients comment that the firm "knows the industry and can assist us in making business judgments".