Wow! Thank you for sharing the information and the accompanying images! It was a treat for me to take a look at this galaxy of stars from that golden era! They make today's stars pale by comparison.
It's always fun to be watching a movie and seeing a Charlie Chan actor, especially when that actor portrayed a son of Charlie Chan. It's even possible to catch a glympse of a Chan daughter in another film!
For MGM studios, Keye Luke was under contact to appear in the Dr. Gillespie film series. The Gillespie films were a spin-off of the Dr. Kildare series, which began in 1938. MGM produced six Dr. Gillespie films (1942-1947) and Mr. Luke appeared in five of the films as Dr. Lee Wong How.
After the Gillespie series ended, Mr. Luke returned to the Charlie Chan series, as Number One Son, produced by Monogram Pictures.
In the 1944 MGM photograph, we see so many great stars from the past, including the late great Lucille Ball. In 1972, Mr. Luke appeared as a guest star on the "Here's Lucy" sitcom starring Ms. Ball.