This is being written by Bruce Babcock, son of Horace W. Babcock (1912-2003). Horace was at McDonald during parts of the year 1940. I'm not sure if he would be considered a staff or a visiting astronomer. I know he was brought in by Otto Struve after a stint at Yerkes in Williams Bay, Wisconsin. It was there he met my mother and they were married on July 1, 1940.
McDonald staff members