[1][5] Alexander owned sugarcane plantations as well as sugar refining factories in Hawaii.
[1] He also served as the Vice President of the Matson Navigation Company and the Honolulu Oil Corporation.
[5] Alexander served on the board of trustees of the Carnegie Endowment for International Peace.
[1] He was a member of the Japan Society of San Francisco and a co-founder of the Institute of Pacific Relations.
[2] As an adult he lived in Piedmont, California, and moved back to Hawaii where he died.