scared driver delight: Titles cater to the current profession.
My former political science professor has both a PhD and JD. He is not teaching or practicing law in our classroom. Thus, he goes by Dr.______ to fit his profession.
Titles also change when one’s title is promoted. A JD who goes back to get a master’s of laws then becomes a LLM. Someone can also go from a master’s in something to a PhD or MD.
When someone has multiple titles that are current used for one’s profession, one can combine them.
*****Think of the case where a psychologist has multiple titles following his or her name, all which are relevant to his or her profession, such as Dr. Psychologist Therapist, PSY.D, P.A.
*****And Dr. Medical Doctor Surgeon, MD FACS.
If either of these doctors were also rabbis, then adding the title would typically only occur if their job is using his or her rabbinical specialty.
If a pediatrician is also a mohel, then Dr. Pediatrician, MD, CM*
*Certified Mohel by the Orthodox Rabbinical School of Mohels (I made this school up to illustrate the point).