Manfred Kohrs (born 24 January 1957) is a German tattooist and conceptual artist, who has been tattooing since 1974. He was a student of Horst Streckenbach ("Tattoo Samy") (5 August 1926 – 27 June 2001). Together they developed the barbell piercing in 1975. Kohrs invented a rotary tattoo machine with main part an electric motor and an ink reservoir. In 1977 Kohrs founded the first German Tattoo Artist Association.He gave up tattooing in 1990 and began studying economics. Since completing his economics degree in 1996, he has served as tax consultant and Certified Public Accountant (GER).