Wittmann was born in
Henstedt-Ulzburg. He studied art history at the
University of Hamburg and has been a visiting lecturer there. He worked for the Arno Schmidt Stiftung from 2009 to 2012 and was involved in the conception of the exhibition 'Tattoo' (2015) at the
Museum für Kunst und Gewerbe Hamburg. His doctoral thesis
Tattoos in der Kunst is concerned with material specific aspects and the iconology of tattoos, he received his Ph.D. in 2017. Since December 2015, Wittmann is a
postdoctoral scholarship holder of the Hamburger Stiftung zur Förderung von Wissenschaft und Kultur (Hamburg Foundation for the Promotion of Science and Culture) working on a research project on the estate of the German tattooist
Christian Warlich (1891–1964) in cooperation with the Stiftung Historische Museen Hamburg/
Museum für Hamburgische Geschichte. Wittmann is the founder and owner of the company Nachlass Warlich. He is an executive board member and research director of the nonprofit organisation
Institut für deutsche Tätowier-Geschichte e.V. (IDTG) since 2018. Wittmann is the curator of the exhibition "Tattoo-Legenden. Christian Warlich auf St. Pauli" (2019/20) at the Museum für Hamburgische Geschichte. ==Honours==