Searching information online about actress Susan Fox, I found little to nothing. Apparently Fox was one of the many women considered for the role of Scarlett O'Hara in Gone With the Wind (1939) and, according to IMDB, she co-starred with Orson Welles in the 20-minute Welles' comedy The Green Goddess (1939). But that's all I found, with no photo of Fox anywhere. She was obviously an aspiring actress whose Hollywood career never took off.
Robert Ritchie was a MGM publicist and talent scout, responsible for recruiting Hedy Lamarr, Luise Rainer and Greer Garson. He is probably best known for his relationship with Jeanette MacDonald in the early 1930s. Ida Koverman (a friend of MacDonald's and secretary to MGM boss Louis B. Mayer) had once described Ritchie as "a schnorrer or parasite".
In the letter below —postmarked 3 January 1940 and addressed to Howard Hughes— Susan Fox complains about Ritchie hindering her career after she had refused to sleep with him. It's ironic that Fox should be complaining to Hughes about Ritchie, considering Hughes also abused his power to obtain sexual favours from women. Reportedly Hughes was a friend of Fox, as was Katharine Hepburn who is also mentioned in the letter. In the end, as said, Fox's film career never happened; perhaps it was her experience with Ritchie that made her pursue a different career.
|(l) Robert Ritchie pictured with Jeannette McDonald circa 1931 and (r) Howard Hughes|