[3] He graduated from Harvard College in 1911 and that December was a founding member of the Boston Athletic Association ice hockey team.
[1][4] Hornblower was a top amateur golfer and won the 1915 Boston Athletic Association golf championship.
[5] In 1916, Hornblower married Eleanor Greenwood, daughter of former President of the Massachusetts Senate Levi H.
[7] He left the firm during World War I to serve as a Lieutenant in the United States Navy.
[1] During his career, Hornblower was a director of numerous companies, including the Bangor and Aroostook Railroad and the Saco-Lowell Shops.