sentences:  Johnson Stokes & Master was formed in 1863 in Hong Kong and is today known as Mayer Brown (formerly Mayer Brown JSM) after merging with "Mayer Brown" in 2008.The firm has offices in Bangkok, Beijing, Brussels, Charlotte, Chicago, Düsseldorf, Dubai, Frankfurt, Hanoi, Ho Chi Minh City, Hong Kong, Houston, London, Los Angeles, Mexico City, New York City, Palo Alto, Paris, San Francisco, Shanghai, Singapore, Tokyo, and Washington DC; and, in association with Tauil & Chequer Advogados, offices in Brasília, Rio de Janeiro, São Paulo, and Vitória.Mayer Brown is a signatory to the Pro Bono Institute's Law Firm Pro Bono Challenge, which commits the firm to devote 3 percent of total billable time to pro bono work and a member of the UK Joint Protocol on Pro Bono Work, which stipulates that pro bono legal work must be carried out to the same standard as chargeable work.