Professor Johner is an expert for development and approval of medical devices that contain software or that are software. As an auditor, member of a standards committee, trainer of notified bodies and author of several books and guidelines, Dr. Johner contributes to the advancement of the regulatory landscape. His company, the Johner Institute, provides worldwide regulatory guidance and tests medical device. Christian Johner taught at several universities e.g. in Konstanz (Germany), St. Gallen (Switzerland), Würzburg (Germany) and at Stanford University (USA).