From their website:
5 Generations. Over 150 Years of Soapmaking Excellence. Dr. Bronner’s is synonymous with Old World quality and time-honored simplicity, which can be traced back to the family’s German-Jewish soapmaking tradition. Born in 1908 to a Jewish family that had been making soap since 1858, Emanuel Bronner was the third generation certified as a master soapmaker under the guild system of the time. In 1929, he brought his formulas for high-quality liquid and bar soaps to America, starting Dr. Bronner’s in its current form in 1948.