At the museum he devoted time to studying the Archaeoceti, primitive whales from the Eocene and early Oligocene, and the Miocene Cetacea of North America. In 1948 he was appointed director of the Museum and in 1958 was made assistant secretary of the Smithsonian Institution.
He spent time at the museum studying Archaeoceti, primitive whales from the Eocene and early Oligocene, and Miocene Cetacea of North America. In 1948, he was appointed director of the Museum, and in 1958, he became an assistant secretary of the Smithsonian Institution.