We are pleased to announce the successful doctorate of Philipp Nachtigal. In his dissertation entitled "Novel recirculation blower with droplet separator for PEM fuel cells", Mr. Nachtigal developed innovative solutions to increase the efficiency of fuel cells. His research makes a valuable contribution to the further development of hydrogen technology and the promotion of sustainable energy. We would like to congratulate Mr. Nachtigal on this significant achievement and wish him all the best for his future projects.