Johann Jakob Pfeiffer was a German evangelical theologian, as well as a professor, and later, dean, at the University of Marburg.

The Friedrichsgymnasium is a humanistic classical gymnasium, located in Kassel, Hesse, Germany, that focuses on music and foreign languages, particularly Latin and Ancient Greek. The mission statement of the school is to spread the ideas of humanism and tolerance and to ensure the students grow up to become independent, educated and responsible, following the school motto "Learn what you are and be such", a quote by the Ancient Greek poet Pindar. The school is a so-called "Gymnasium", a secondary school that offers the highest possible standards in education and aimes for the students to take their A-Levels, the "Abitur", in year 13. The school specializes in supporting highly gifted students and has a tradition of encouraging students to be competitive and exceed their limits. However, the school also highlights the importance of tolerance and solidarity, taking part in projects with hospitals and refugee organisations.