Konrad Lehmann completed his business studies at the University of Siegen in 1991 (Diploma in Business Administration). After ten years of building expertise in marketing, PR, and sales for a cooperative group in the electronics retail industry, his path led him to WERTGARANTIE Group in 2002 as Head of Marketing.

Ten years later he was appointed as a department head at the former WERTGARANTIE AG, and in 2013 he became a member of the management board. Since 2016, he has been a board member of WERTGARANTIE SE. He is responsible for marketing, corporate communications, sustainability management and customer management, as well as input and output management.