In 1897, Hippel attained the title of "professor extraordinary" at Heidelberg, and in 1909 became a professor at the eye clinic in Halle. In 1914, he became a professor of ophthalmology in Göttingen.
^In German personal names, von is a preposition which approximately means 'of' or 'from' and usually denotes some sort of nobility. While von (always lower case) is part of the family name or territorial designation, not a first or middle name, if the noble is referred to by their last name, use Schiller, Clausewitz or Goethe, not von Schiller, etc.