As head of the executive branch, the president must appoint the top officials for all of the federal agencies. These positions are listed in the Plum Book which outlines more than 7,000 appointive positions in the government.
1 When you have a Ph.D., sign your name either as Dr. Ernest Smith or Ernest Smith, Ph.D. 2  If you have a Ph.D. you should engrave all your personal envelopes or labels with either Dr. Ernest Smith or Ernest Smith, Ph.D.his is the teaching of St. Thomas Aquinas in his Treatise on Justice. (Question 58). Therefore, one should address a person with a doctorate by his title, and the person should have no fear in calling himself or herself by that name.
Alright, just thought I would report an issue with Cortana handling acronyms. I have set my name to Cortana as Mr.Dr.Prof. Alex, in 50 % of occasions when I ask Cortana my name, she will pronounce it as: Mister Doctor Professor Alex, which is the correct way. However in the other 50 % of times, she will respond: Mister Doctor Prof Alex. Alas, extending 2 of the acronyms but not the last one.