Franz Boas was born in Minden, Westphalia. Although his grandparents were observant Jews, his parents embraced Enlightenment values, including their assimilation into modern German society. Boas's parents were educated, well-to-do, and liberal; they did not like dogma of any kind. Due to this, Boas was granted the independence to think for himself and pursue his own interests. Early in life he displayed a penchant for both nature and natural sciences. Boas vocally opposed anti-Semitism and refused to convert to Christianity, but he did not identify himself as a Jew;[8] indeed, according to his biographer, "He was an 'ethnic' German, preserving and promoting German culture and values in America."[9] In an autobiographical sketch, Boas wrote