He obtained his doctorate in Göttingen under the supervision of David Hilbert.

He studied mathematics at the University of Vienna and obtained his doctorate in 1923, under the supervision of Philipp Furtwängler.

Maurer obtained a doctorate under the supervision of Otto Behaghel in 1922, who was to have a lasting influence on Maurer's work.

In 1961 he obtained a second Ph.D. (in philosophy) under the supervision of Stoker.

In 1993 he obtained his PhD under the supervision of the historian Bogo Grafenauer.

In 1923, he obtained his doctorate in physics at Harvard, under the supervision of William Duane.

Hilb obtained his Ph.D. in 1903 under the supervision of Ferdinand von Lindemann.

Ross obtained his doctorate from Monash University under the supervision of Michael Janover.

In 1974, he obtained his Ph.D degree in folklore under the supervision of Prafulladatta Goswami.

She obtained her PhD in 1970 under the supervision of Vasilij Melik.