As a result of this in the late 1950s, Clark's work came to the attention of the Director of Naval History, Rear Admiral Ernest M. Eller at the Naval History Division of the Navy Department (now the Naval Historical Center) and the head of the Early History Branch in that office, Dr. William J. Morgan.
Due to this development in the late 1950s, Clark's research gained recognition by Rear Admiral Ernest M. Eller, Director of Naval History, and Dr. William J. Morgan, chief of the Early History Branch within the Navy Department (now the Naval Historical Center).