William Theophilus Bonniwell Jr. (1836–1889)[1] was a member of the Wisconsin State Assembly, the Minnesota Senate and the Minnesota House of Representatives.
Bonniwell was born on August 10, 1836, in New York City.
[2] He moved with his parents to Milwaukee County, Wisconsin, in 1839.
From 1850 to 1852, he took part in the California Gold Rush.
He was later a member of the Senate in 1871 and again from 1878 to 1882 and of the House of Representatives in 1877.