Bishop William Patrick Callahan is a Roman Catholic bishop who has served as the Bishop of the Diocese of La Crosse in Wisconsin since 2013. He was born on March 22, 1947, in Milwaukee, Wisconsin. Bishop Callahan was ordained a priest in 1975 and later became a bishop in 2012, when he was appointed as the auxiliary bishop of the Archdiocese of Milwaukee. Throughout his ministry, Bishop Callahan has focused on promoting education, youth ministry, and social justice within the church. He has also been involved in various community outreach programs, emphasizing the importance of faith and service in the lives of individuals and families in his diocese.