After the conversion to the Protestantism (he was supported by Franz von Sickingen and Ulrich von Hutten), upon the insistence of the Dean of Frankfurt Johann Indagine, Brunfels became a minister at Steinau an der Straße (1521) and later, in Neuenburg am Rhein.
Despois da súa conversión ao protestantismo (foi apoiado por Franz von Sickingen e Ulrich von Hutten), ante a insistencia do Deán de Frankfurt Johann Indagine, Brunfels se converteu en ministro en Steinau an der Straße (1521) e despois en Núremberg e Rin.