Josef Jadassohn

Joseph (Josef) Jadassohn (10 September 1863 in Liegnitz – 24 March 1936 in Zurich) was a German dermatologist.

Jadassohn was among the first to take an immunological approach in research of dermatological disorders, and contributed to the understanding of the immunopathology of tuberculosis and trichophytosis.

He was a pioneer in the field of allergology, and is credited for introducing patch testing for diagnosis of contact dermatitis.

[1] In 1901 he described a rare childhood dermatological disorder known as granulosis rubra nasi.

Together with his assistants, Walter Dössekker (1868–1962), Max Tièche (1878–1938), and Felix Lewandowsky (1879–1921), he shares the following eponymous medical conditions: Jadassohn published a revision of Edmund Lesser’s Lehrbuch der Haut- und Geschlechtskrankheiten (14th edition, 1927–30), and from 1927 published the multi-volume Handbuch für Haut- und Geschlechtskrankheiten.