The first CTIO Director during 1963-1966. During the early 60's he directed the site surveys on horseback, searching for an adequate site for an astornomical observatory, which ended with the discovery of Cerro Tololo. Dr. Stock not only selected the site, he was instrumental in the construction of the road to the sumit and of the first installations of the observatory itself. His contributions to many areas of astronomy and other sciences played a key role in the development of astronomy in Latin America.
Dr. Stock passed away in April, 2004