<p> <strong> Han Fey </strong> is a mechanical engineer and a passionate lock collector from Europe. He is well-known for his in-depth articles on high security locks (downloadable at http://www.toool.nl). Because of his articles and reputation, lock companies worldwide invite him to their factories and ask his advice on improving their lock products. Han is also very active in lock R&D, testing, forensic research, and training people in the lock and security industry. </p>