sentences:  Mayer Brown has more than 1,500 lawyers and by revenue is the 19th largest law firm in the world.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".