His father was Nicolai (Nicholas) Sonnichsen who was a captive of the Union Army during the American Civil War.
Albert Sonnichsen was an important leader of the Cooperative Movement in America. In 1920 he settled in Connecticut and managed his poultry farm. He died in Willimantic, Connecticut in 1931 at age 53.
- Ten months a captive among Filipinos (1901) text
- Deep Sea Vagabonds (1903) text
- Confessions of a Macedonian Bandit (1909) text
- Consumers' Cooperation (1919) text