(the linked reference is the abstract of the original 1934 paper)
Cornelius Gysbert Dyke (1900-1943) : Cornelius G. Dyke was a pioneering American radiologist who is widely considered the first to dedicate his entire professional career to the field of neuroradiology. He helped establish the importance of neuroradiology in the diagnosis and treatment of neurological disorders. Dyke was a brilliant diagnostician and helped set the standard for the field's growth in North America. He was recognized for his contributions in using pneumoencephalography The American Society of Neuroradiology has an award named in his honor.
Leo M. Davidoff (1898-1975) : Leo M. Davidoff was a prominent American neurosurgeon and a key figure in the development of modern neurological surgery. He was a student of Harvey Cushing and was instrumental in establishing the Albert Einstein College of Medicine in New York City. His book "The Abnormal Pneumoencephalogram," is dedicated to the memory of Cornelius Dyke.
Clement B. Masson ( ?? - 1945) : Clement B. Masson was an American neurosurgeon at the Neurological Institute of the Columbia-Presbyterian Medical Center.