Johnson Stokes & Master (JSM) was one of the oldest and largest law firms in Asia before it was combined into Mayer Brown on January 28, 2008 to become Mayer Brown JSM. JSM had offices in Hong Kong, where it was one of the leading law firms, and in Beijing, Guangzhou and Shanghai on mainland China, as well as in Bangkok, Thailand and Hanoi and Ho Chi Minh City, Vietnam. Before the combination, the firm had a team of 800 staff, including more than 260 lawyers.According to the firm, JSM was one of the top three foreign law firms in Thailand and Vietnam. Elaine Lo, senior partner and chairman of the Partnership Board of JSM, continues to serve as Chairman of the Asia Board and manages the Asian offices.