Exhibits Specialist Rolland O. Hower; Clock Watcher Edwin A. Battison, 1970, Smithsonian Institution Archives, Exhibits specialist Rolland O. Hower with a crown of thorns starfish, part of the only living exhibit in the National Museum of Natural History; Edwin A. Battison, the Smithsonian's professional clock watcher, poses with a replica of the 14th century De Dondi clock in the National Museum of History and Technology, now known as the National Museum of American History..