This correspondence is between Thanhouser actress Mignon Anderson and Alan Brock. According to IMDb.com, Brock was known for Shriek of the Mutilated, a horror film released in 1974. According to research, he worked as an agent for silent film actors during the early 1930s. He was also a writer for magazines and newspapers. Mignon Anderson was one of the best known Thanhouser actresses and acted with Thanhouser from 1911-1916. After Thanhouser, she worked with several studios to include Universal.