Cardinal Gerhard Müller is a prominent German theologian and a high-ranking official in the Roman Catholic Church. Born on December 31, 1947, he served as the Prefect of the Congregation for the Doctrine of the Faith from 2012 to 2017, a position responsible for safeguarding Catholic doctrine. He has authored numerous works on theology and has been influential in discussions about faith and morality. Müller was appointed a cardinal by Pope Benedict XVI in 2012. He has been an advocate for traditional Catholic teachings and has often engaged in public debates regarding contemporary issues within the Church. His contributions to theology and Church governance have made him a significant figure in modern Catholicism.