Samuel Thomas Alexander (October 29, 1836 – September 10, 1904) co-founded a major agricultural and transportation business in the Kingdom of Hawaii.

[2] Samuel Thomas was born October 29, 1836, at the Waiʻoli mission in what is now Hanalei on the northern coast of Kauaʻi island.

[6] In 1863 Alexander became manager of the Waiheʻe sugarcane plantation near Wailuku, hiring Henry Perrine Baldwin (1842–1911) as assistant.

But to raise their production a steady supply of water was needed for the semi-arid dry forests of Pāʻia.

Alexander realized that rain was plentiful miles away in the rainforests on the windward slopes of Haleakalā mountain.

Alexander proposed a 17-mile-long (27 km) irrigation aqueduct that diverted water from that part of Haleakalā to their plantation.

[9] Work started on the aqueduct in 1876 and was completed two years later in 1878 (at over three times the estimated cost), just before a deadline in the lease.

[10] In 1883 the Alexander family moved to Oakland, California, to get medical attention for his father, who died there August 13, 1884.

A&B is listed on the New York Stock Exchange and was added as part of the Dow Jones Transportation Average[18] after purchasing Matson Navigation Company.

The men were looking forward to hunting big game in Africa, while Annie was developing an interest in paleontology.

The swimming pool at Punahou School was named for their daughter Elizabeth Pinder Waterhouse (1903–1920) who was a student there when she died.