Woodrow Wilson is the only US President to have held a PhD. He gained his doctorate in political science from John Hopkins University.
Ingeborg Rapoport is the oldest person to ever receive a regular Doctorate degree. She submitted her thesis on diphteria in Nazi Germany 1937 but was refused oral examination because she was jewish. She successfully defended her thesis 2015 at the age of 102.
Despite having a PHD in statistics, Carl Gugasian, the most prolific bank robber in American history AKA the Friday Bank Robber, chose a life of crime because he feared that he would never find a job due to spending 2 years in prison as a teenager for robbing a candy store.
PhD students are 2.5 times more likely to develop psychiatric disorders than highly educated general population.
Calling yourself “doctor” if you don’t hold a PhD earned in Germany is a criminal offense.
There are over 5,000 janitors in the U.S. with PhDs.
The PhD is not the highest degree a person can receive. There is also a Doctor of Sciences (DSc/ScD) and Doctor of Letters (DLitt/LittD) which is normally awarded in Britain, Ireland, and the commonwealth nations though it is occasionally awarded in the United States. It is normally awarded for a substantial and sustained contribution to the art to which it applies – for example science and literature. Mark Twain was awarded a Doctor of Letters by Oxford University. Just to add to the confusion, there is also a PhB which is a bachelor of philosophy which is equal to a Masters degree despite its name.