Here is my grandfather, Peter Stoner. He taught math and astronomy at Pasadena City College (PCC) (Pasadena, California, USA), from about 1912 (when it was still Pasadena High School) until he retired in the 1950's. He was also the head of the mathematics and physical sciences departments. (Photo from yearbook.)
My grandfather was involved in the building of the observatory at PCC. Here it is in progress.
Here is a photo that my grandfather took of Albert Einstein at the celebration to dedicate the newly built observatory at Pasadena City College in Feb. 1931.
A pamphlet on the history of Pasadena City College says this about the event:
"Pasadena Junior College hosted many well-known speakers. Albert Einstein was enthusiastically welcomed by some 8,000 people, including students from the city schools and the Junior College, when he appeared to dedicate the astronomy observatory in February 1931. Dr. Einstein spoke in German, so a translation of his speech was read by the principal. Despite this difficulty, the usually shy and unassuming physicist seemed to have no trouble
relating to the students and residents of Pasadena."