Professor Siegel studied medicine at the University of Erlangen and then completed his further training as a specialist in psychiatry and psychotherapy. He completed his doctorate at the Ruhr University in Bochum and subsequently worked as a specialist, including at the Psychotrauma Centre of the Bundeswehr Hospital in Berlin, at Charité Universitätsmedizin Berlin and in standard psychiatric care in rural areas.

Born in Augsburg, he previously held the professorship for Medicine in Social Work at the Protestant University of Applied Sciences in Nuremberg before taking up the professorship for Social Psychiatry at Nordhausen University of Applied Sciences. His research focuses on psychotraumatology, psychotherapeutic care and sexology. Professor Siegel is a colonel in the reserves, a member of various professional associations and, in particular, on the board of the German Society for Sexual Medicine, Therapy and Science (DGSMTW).

With his professional experience in the fields of psychiatry, psychotherapy and sexology, he would like to impart not only theoretical knowledge to students in these areas, but also very practical skills such as communication and therapeutic competences. He would also like to deepen his scientific work in the field of application-orientated healthcare research at the university and the Institute for Social Medicine, Rehabilitation Sciences and Health Services Research (ISRV).