Concluding remarks: Thirty years of neutron interferometry

The quantum interference of neutron deBroglie waves extending over macroscopic distances is one of the most startling and fundamental realizations of the predictions of quantum mechanics. Because the neutron experiences all four basic forces of nature (strong, weak, electromagnetic and gravitational), neutron interferometry has proven to be a broad and fertile testing ground for theory. Since the earliest experiments in Vienna, Ann Arbor and Grenoble, there have been at least 50 neutron interferometry experiments which can be said to test and elucidate the fundamental fabric of physics. It has been a great pleasure for me to have been a part of this field for the past three decades, and to have had so many wonderful students and collaborators around the world. Indeed, it is an honor to thank them all at this conference.