IP is the core practice area of law firm Chang Tsi & Partners. Headquartered in Beijing, with branches in Shanghai, Guangzhou, Shenzhen, Hong Kong and two liaisons in the United States, this firm has had another busy, fruitful year with significant victories in litigation. Its soft IP practice, led by Spring Chang and Simon Tsi, "operates at the highest level of sophistication, creativity and resourcefulness". One market commentator describes the team as "efficient, thorough and practical". A client notes: "They are the most consistent firm I've worked with in terms of accuracy in legal advice, turnaround time, practicality and partnership." Its clientele leaves rivals green with envy and includes Johnson & Johnson, Twitter, Formula One Licensing B.V., 3M, Michael Kors, Mondelez International, Guinness World Records, Air China, China Railway, Agriculture Bank of China and Midea Group.