He has four honorary doctorates. It is his prerogative if he wishes to use that title. From Wikipedia: "Recipients of an honorary doctorate may if they wish ad

He has four honorary doctorates. It is his prerogative if he wishes to use that title. From Wikipedia: "Recipients of an honorary doctorate may if they wish adopt the title of "doctor". In many countries, including the United Kingdom, Australia, New Zealand, and the United States, it is now a matter of personal preference" "The term honorary degree is a slight misnomer: honoris causa degrees, being awarded by a university under the terms of its charter, may be considered to have technically the same standing, and to grant the same privileges and style of address as their substantive counterparts, except where explicitly stated to the contrary."