Ms. Bierther began her training at Bayer AG in 1979 as a chemical worker in the pigments and ceramics department. She then worked there in quality assurance. Internal retraining took place in 1991 and Ms. Bierther worked in the secretarial area of today's Additives business unit until 2005. She has been a full-time member of the works council since 2005. In 2013, she was elected Chairwoman of the Works Council at LANXESS in Cologne. Ms. Bierther is also a member of the General Works Council, the Economic Committee and the LANXESS Europaforum.