Joseph Müller was a German Catholic priest and theologian who became a critic of the Nazi regime. Born in Salmünster in 1894, he served in the First World War before pursuing his religious vocation. After studying theology in Münster, he was ordained in 1922 and served various parishes, including roles in Duderstadt and Bad Lauterberg. He was particularly dedicated to providing spiritual guidance to young workers. His opposition to the Nazi government eventually led to his arrest, trial, and execution in 1944.