Claus Friedrich Wisser[1] (30 June 1942 – 4 October 2023) was a German businessman and philanthropist, a patron of music and the arts.

[5] He studied business administration at the University of Frankfurt, and took part in the first students' revolt, opposing the German Emergency Acts.

[6] In 1965, Wisser founded a company for the cleaning of office buildings; he posted an advertisement seeking a used working typewriter as a gift.

[4] The company grew to become Wisag [de], a business focused on cleaning, maintenance of parks, security, and catering, among others,[4] with 50,000 employees.

[9][11] In honor of his 60th birthday on 30 June 2002, the festival staged a performance of Carl Orff's Carmina Burana at Eberbach Abbey, with soloists Annette Dasch, Gert Henning-Jensen, and Željko Lučić, the choir Orfeón Donostiarra, and the hr-Sinfonieorchester conducted by Hugh Wolff, which was recorded.

[8][7] Boris Rhein, Minister-President of Hesse, said: "In Claus Wisser verlieren wir eine Persönlichkeit, die sich vollends in den Dienst der Gesellschaft gestellt hat.

Auf den Feldern Bildung, Kunst und Kultur hat er mit viel Herzblut gewirkt.