[1] He was one of the pioneer founders and trustees of the Los Angeles Public Library System to open branches.
About 1845, he moved to Fall River and, in 1849, to Wareham, where he was married to Mary Bradford Gibbs the same year.
[4] In May 1895, the Caswells made a trip to Europe, returning aboard the RMS Campania of the Cunard Line.
At midday, though, he returned to his home at the southeast corner of West 5th Street and Grand Avenue in Downtown Los Angeles, the site of the present day Los Angeles Central Library he helped found.
[4] "The news spread rapidly and many friends of the family hastened to the Caswell residence to offer their condolences and any assistance they might render."
He opened a general merchandise store with John F. Ellis at the corner of Los Angeles and Arcadia Streets downtown.
2½ years later, in August 1879, they received a mineral lode patent from the U.S. government, which gave them title to the oilfield.