[3][4] Wiesheu completed an investment banking trainee program in 1987 and then held various positions at Commerzbank.
[1] In 1991, he joined the Commerzbank subsidiary Commerz International Capital Management GmbH (CICM) in Frankfurt.
During this time, he was also a member of the board of directors of the Japanese Asset Management Association in Tokyo.
[8] In addition, Wiesheu has been a member of the executive board and the assembly of delegates of the Association of German Banks since July 2023.
[15] He served as a spokesman for the economic delegation of German chancellor Olaf Scholz on his first trip to Japan in 2022[16] and in 2023 for the first German-Japanese government consultations.