|No. of offices||22|
|No. of lawyers||more than 1,500|
|Major practice areas||General practice|
|Key people||Paul W. Theiss (Chairman)
Kenneth S. Geller (Managing Partner)
|Revenue||$1.223 billion (2014)|
Mayer Brown is a law firm. With offices in 22 cities across the Americas, Europe and Asia, global law firm Mayer Brown has approximately 1,500 lawyers and by revenue is the 14th largest law firm in the world. The firm has been ranked as one of the 50 most prestigious law firms by Vault.com.
The three firms that now form the core of Mayer Brown were all founded in the 19th century. The US portion of the firm was founded in 1881 in Chicago, by Adolf Kraus and Levy Mayer, and was shortly thereafter known as Kraus, Mayer & Brackett. After several changes in name to reflect its changing membership the firm eventually became known in the US as Mayer, Brown & Platt. The English portion of the firm, Rowe & Maw, was established in 1895 in London and operated under that name until joining with Mayer, Brown & Platt in 2002 to form Mayer, Brown, Rowe & Maw. In 2007 the amalgamated firm shortened its name to Mayer Brown. Johnson Stokes & Master was formed in 1863 in Hong Kong and is today known as Mayer Brown JSM after merging with Mayer Brown in 2008.
The firm has offices in Bangkok, Beijing, Brussels, Charlotte, Chicago, Düsseldorf, Frankfurt, Hanoi, Ho Chi Minh City, Hong Kong, Houston, London, Los Angeles, New York, Palo Alto, Paris, Shanghai, Singapore and Washington DC; and, in association with Tauil & Chequer Advogados, offices in Rio de Janeiro and São Paulo.
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. 
- On Law360's “Global 20” 2013 list of law firms doing the most substantial, complex and diverse global work
- 42 top-tier national and 90 top-tier metropolitan U.S. News Best Law Firms 2013 rankings
- 362 lawyers ranked across the Chambers 2013 directories, with 74 ranked in top band or higher.
- Ranked #2 for client service among 650 global law firms in the BTI Client Service A-Team 2013 survey.
- Named “International Firm of the Year 2013 – International Trade” by China Law & Practice.
- Ranked in 48 categories, including seven top-tier ranking, by IFLR1000, a guide to the world’s leading financial law firms.
- 65 Leading Lawyer rankings and 175 practice category rankings, 23 of which are top-tier, across the most current Legal 500 directories.
- Received a perfect score in the 2014 Human Rights Campaign Foundation’s annual Corporate Equality Index (CEI) and earned the “Best Places to Work for LGBT Equality” distinction. The CEI rates American businesses on their treatment of lesbian, gay, bisexual and transgender (LGBT) employees and their families as well as their demonstration of corporate commitment to LGBT equality.
Role in Refco Inc. Collapse
Refco was a New York-based broker of commodities and futures contracts. It filed for one of the biggest bankruptcies in the USA history in 2005, after the evidence for major accounting fraud surfaced. In the wake of collapse, lawsuit was filed against Mayer Brown for aiding Refco executives' theft of more than $2 billion. In November 2012 Joseph Collins, a former partner at the Mayer Brown, was found guilty on multiple charges of conspiracy and fraud for his role in preparing Refco's IPO. The law company itself agreed to pay an undisclosed sum to settle the legal claims against it.
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- "Refco Files 4th-Largest Bankruptcy in U.S. History". Archived from the original on 2013-10-11.
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- Carlile, Nathan (July 27, 2007). "In a Time of Transition, Mayer Brown Looks to Its Trio of Leaders". Legal Times (Washington, D.C.: ALM).
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- Scheiber, Noam (July 21, 2013). "The Last Days of Big Law". The New Republic.