In the United States, most doctors of divinity hold a degree conferred "honoris causa" by a church-related college, seminary, or university to recognize the recipient's achievements as a minister of religion. For example, Martin Luther King Jr. graduated as a Ph.D. in systematic theology from Boston University in 1955 and subsequently received honorary Doctor of Divinity degrees from the Chicago Theological Seminary (1957), Boston University (1959), Wesleyan College (1964), and Springfield College (1964). Billy Graham, who received honorary Doctor of Divinity degrees from The King's College and the University of North Carolina at Chapel Hill, was regularly addressed as "Dr. Graham", though his highest earned degree was a Bachelor of Arts degree in anthropology from Wheaton College.