He is a past president of HumorCare Germany, an established European therapeutic humor organization (www.humorcare.com), and a recognized pioneer of therapeutic humor in Europe. Dr. Titze has authored numerous articles, book chapters, and books on the subject of therapeutic humor. His published books in German include «The Healing Power of Humor» (1985), The Therapeutic Power of Laughter» (1995), «Therapeutic Humor» (1998, with C. Eschenröder), and «The Humor Strategy» (2004)