 In 1863 he received his habilitation, and in 1873 became an associate professor.In 1881 he was appointed professor of dermatology and successor to Carl Ludwig Sigmund (1810–1883) as director of the clinic for syphilis.In an 1886 publication of "Vierteljahrsschrift für Dermatologie und Syphilis", he described a type of pemphigus vulgaris, which later became known as Pemphigus vegetans of Neumann.