A firm that is predominantly known for acting on behalf of pharmaceutical companies, E B Astudillo & Associates is focused on inbound work and has over time developed a client base that rivals the best IP law firms in the country. Founding partner Enrico Astudillo heads the IP and litigation groups, with support from staff members Reena Mitra, Angelo Perez and Diana Rabanal, and is consistently ranked first in the number of patent cases filed and granted each year. The firm compares the efficiency of its trade mark practice to a "well-oiled machine". This view is shared by many, with the firm's client list including GlaxoSmithKline, Novartis and Pfizer.