University of Bonn

Welcome to the Institute of Old Catholic Studies


The Institute of Old Catholic Studies is TOCCUSA's new partnership with Dr. Gunter Esser of the University of Bonn to bring the teachings of the Old Catholic Church to both Clergy and students around the world. Whether you are an active Clergy member or just a student looking to advance your knowledge of the Old Catholic ways, you have come to the right place.

Each week, Dr. Gunter Esser will be recording and posting his lectures at the University of Bonn and posting the videos here at the IOCS for registered students to review and learn from. In addition, the IOCS offers an interactive online forum where students can post questions regarding the videos or related topics. These discussions are viewed and discussed by Dr. Gunter Esser and all other registered students. This is an incredible way for us to find answers to our questions and to catalog the knowledge of the Old Catholic ways.

Register as a Member


IOCS membership is limited to a small number of students for each of Dr. Gunter Esser's courses in order for us to maintain an intimate environment where he is able to interact with and respond to each student. As new courses start, seats will become available and will be filled on a first-come-first-serve basis.

If you are interested in becoming a member of the IOCS and attending an online course, please fill out the registration form by clicking the link below.

Register Now

Course Schedule