This is none other than Frank Scott Hogg, Ph.D. (Harvard), Professor of Astronomy, etc, etc, and also the husband of Helen Hogg. I am sure you can find an obituary in the Journal [JRASC 45,1]. Frank had a weak heart and died prematurely in 1949, I believe -- otherwise he would have been the third Director of DDO. It is a good picture of him, showing his piercing but firendly eyes.
Photo by R. Northcott, Nov. 1950. Note by D.A. MacRae, 1998.
This man, with the Mephistophelian/Orson Wellsian visage, is Ralph E. Williamson, Ph.D. Chicago, a student of Chandrasekhar. Ralph came to UofT/DDO in 1946 or so. He and I had been great friends together at Cornell. At the start of WWII, we found ourselves teaching navigation to US Navy Midshipmen recruits. Then I went to Oak Ridge, Tennessee. Ralph stayed on for a bit, working with Charles Seeger onthe Cornell radio astronomy project (now Aricebo) that Charles initiated. Ralph left DDO abruptly to go to Los Alamos, in 1952 or 1953, leaving behind his wife Dorothy Williamson.