Paul Heinrich Friedrich Carl Isenberg was born April 15, 1837, in
Dransfeld,
Kingdom of Hanover,
Germany. His father was
Lutheran minister Daniel Isenberg (1807–1875), and mother was Dorothea (Strauch) Isenberg (1808–1871). He came to the
Hawaiian Islands in 1858. Isenberg moved to the island of
Kauai and first worked in
Wailua. In October 1861 he married Hannah "Maria" Rice, daughter of
William Harrison Rice (February 17, 1842—April 7, 1867). They had two children, Mary Dorothea Rice Isenberg (1862–1949) and Daniel Paul Rice Isenberg (1866–1919), known as "Paul Jr." He traveled back to Germany in 1869 where he married Beta Margarete Glade (born 1846) before returning to Hawaii. They had six more children: Johannes "John" Carl Isenberg (born September 12, 1870), Heinrich Alexander Isenberg (born January 17, 1872), Julie Maria Pauline (Isenberg) Barckhausen (born November 1876), Clara Margarete (Isenberg) Wendroth (born 1878), Richard Menno Isenberg (born 1880), and Paula Bertha Johanna Isenberg (born 1883). Isenberg took over managing the
sugarcane plantation at
Līhuʻe in 1862, after the death of his father-in-law who was previous manager. The plantation was founded by diplomat
Henry A. Peirce, but struggled to make a profit until Rice built an irrigation system. Isenberg made improvements to the
cane sugar mill such as using an evaporating pan and steam pipes to concentrate the cane juice. In 1872 the Lihue Plantation company was officially incorporated, and the expanded by at
Hanamāʻulu. On January 24, 1874, he was appointed to the upper House of Nobles in the
legislature of the Hawaiian Kingdom by King
Lunalilo. He officially became a citizen of the
Kingdom of Hawaii at that time. In 1877 he bought equipment for a new mill from
George Norton Wilcox and installed it at Hanamāʻulu to be managed by
Albert Spencer Wilcox. Although most other plantation laborers were Chinese or Japanese, Isenberg arranged for groups of workers from Bremen to settle on his company's plantations. In the 1887 session of the legislature, he was one of the few who objected to the threat of military force that caused the
1887 Constitution of the Kingdom of Hawaii to be called the "Bayonet Constitution". ==Legacy==