Stephan Bielfeldt has a degree in Bioengineering. He is Vice President Science & Consulting at proderm GmbH in Hamburg / Germany. He is responsible for the development of new skin research methods, as well as the consultancy of customers in the field of clinical studies design and methodology. Stephan has been working in clinical research for more than 30 years. Special fields of his expertise are photobiology / sun protection, in vivo confocal Raman spectroscopy and clinical studies of skin microbiome. His list of publications contains more than 100 scientific publications. He is a member of professional societies, such as the Society for Dermopharmacy (GD) and of scientific working groups of the German Society for Scientific and Applied Cosmetics (DGK). As a member of the ISO TC working group (WG 7) Sun Protection Test Methods, he works on the international standardization of sunscreen testing methods.