Felix Kretzer successfully defended his PhD thesis titled “Designing AI-Based Graphical User Interface Prototyping Assistants“ on March 27th 2025. His work contributes to the fields of human-computer interaction and information systems engineering by providing design knowledge for LLM-based GUI prototyping assistants. His findings present insights for both researchers and practitioners, enabling them to more effectively create GUI prototypes and on this basis ultimately better software systems.