According to additional a documented history, I now understand the following:
William Boone Fleming was born in New Brunswick, Canada, on November 2, 1849. He moved to Boston; October 1874, then moved to Philadelphia in July 1881, then moved to New York or Detroit in 1889 He moved his family to the Los Angeles area in 1900
In 1909, he left his family in the Los Angeles Area, and moved back to Philadelphia to work on an organ.He worked in Philadelphia until 1927 where he retired back to Pasadena with his family.
His wife Julia Coleman (there's some discussion in the family that her middle name was Agusta), died 1919-1920.
He lived in Pasadena until his death in April 1940.