Sonnenschein Nath & Rosenthal LLP (informally Sonnenschein) was an international law firm with nearly 800 lawyers and other professionals in the United States and Europe, serving businesses, non-profits and individuals. The firm was founded in Chicago in 1906 and as of May 2010 ranked as the 58th-largest law firm in the U.S. by revenue. In September 2010 it merged with London-based Denton Wilde Sapte to form SNR Denton.