studied chemistry and has worked primarily in analytical development in the pharmaceutical industry. After holding a management position at a contract organisation, he has now been working as a consultant on topics related to pharmaceutical analysis for many years. His interests include the validation of analytical methods, the planning and evaluation of stability studies, and working with Excel under GMP conditions. He has made it his mission to convey to a wider audience a better understanding of the in-depth approaches to method validation and now also the evaluation of stability studies, as reflected in the development of the ICH guidelines. One of his hobbies is simulating the evaluation of method validations/stability studies, which allows various scenarios to be played out multiple times and is thus better understood.