Anybody who is a doctor.
A doctor should be addressed as doctor business wise. Though it is perfectly alright for friends and family to call him by his name, as anyone.
Steven Moffat has: Played Himself - Show Runner in "Doctor Who in America" in 1983. Played himself in "Imagine" in 2003. Played Himself - Head Writer in "Doctor Who Confidential" in 2005. Played himself in "Paris in the Springtime" in 2005. Played himself in "2005 TV Moments" in 2005. Played himself in "Waking the Dead" in 2005. Played himself in "Doctor Who Confidential" in 2005. Played himself in "The ONE Show" in 2006. Played himself in "BBC Proms" in 2010. Played himself in "Doctor Who: The Ultimate Guide" in 2010. Performed in "NerdHQ" in 2011. Played Himself - Screenwriter in "The Big Picture" in 2011. Played Himself - Writer in "The Big Picture" in 2011. Played himself in "Come in Number Five" in 2011. Played himself in "The Science of Doctor Who" in 2012. Played himself in "The Women of Doctor Who" in 2012. Played himself in "The Timey-Wimey of Doctor Who" in 2012. Performed in "La Nuit Doctor Who" in 2012. Played himself in "Doctor Who in the U.S." in 2012. Played himself in "Sherlock Uncovered" in 2012. Played himself in "Doctor Who at the Proms" in 2013. Played himself in "Doctor Who: The Doctors Revisited" in 2013. Played himself in "Doctor Who 50th Anniversary Live Pre-Show" in 2013. Played himself in "Doctor Who: The Companions" in 2013. Played himself in "Doctor Who: The Ultimate Guide" in 2013. Played Steven Moffat in "The Five(ish) Doctors Reboot" in 2013. Played himself in "Doctor Who Live: The Next Doctor" in 2013. Played himself in "Doctor Who Live: The Afterparty" in 2013. Played Himself - Showrunner, Doctor Who in "Doctor Who Explained" in 2013.
Yes, it is appropriate to address someone with a PhD as "Doctor."
The proper way to address a Doctor of Osteopathic Medicine (DO) (not Doctor of Osteopathy) is Doctor (Dr.) since they are medical physicians.
if they have a doctorate then that's how to address them
Address on envelope to a doctor: Dr. John Doe is the general form.
I am pretty sure you just address it normally until the person is actually a doctor
The cast of Plague Fighters - 1996 includes: Russell Coleman as Himself (CDC doctor) Stacy Keach as Narrator Peter Kilmarx as Himself (CDC doctor) Mungala Kipase as Himself (Zairian doctor) John Krebs as Himself (CDC doctor) Isabelle Lumbwe as Herself (Zairian medical student) Emery Mikolo as Himself (survivor) Innocent Minga as Himself (father of 1st victim) Rita Mupapa as Herself (wife of Dr. Mupapa) Dona Mupapa as Himself (Zairian doctor) Nicole Oganya as Herself (nurse and Ebola victim) Paul Reiter as Himself (CDC doctor) Pierre Rollin as Himself (CDC doctor) Robert Swanepoel as Himself (South African doctor)
The cast of The Doctor - 2013 includes: Larry Bird as himself Julius Erving as himself Michael Jordan as himself
i need to address a doctor this second
Yes, it is appropriate to address someone with a doctorate as "doctor" as a sign of respect for their academic achievement.
None of the previous Doctor's have met the 12th version of himself.