In 1922, Raymond’s Professor at Yale, Charles Schuchert, recommended that then-Director Avinoff hire Professor I. P. Tolmachoff as curator. Tolmachoff, who also served as Professor of Paleontology at the University of Pittsburgh, published prodigiously during his tenure at Carnegie Musuem, authoring sixty-eight papers on a broad range of topics from Siberian geology to Cenozoic foraminifers. His graduate students at the University of Pittsburgh (J. J. Burke, F. Benson, and E. R. Eller) made valuable and important collections from western Pennsylvania and the surrounding States. Although the section’s collections remained largely uncurated, Tolmachoff continued to enlarge the collections by obtaining Harvard Professor Frank Carpenter’s Eocene insect collection, Dr. Carroll Lane Fenton’s Appalachian Devonian specimens, and E.B. Hall’s important collections of Devonian sponges from New York. Dr. Tolmachoff retired as curator of the Section of Invertebrate Paleontology in 1945.