Thomas D. Parkinson (April, 1835 - May 11, 1906) was an American civil engineer and businessman. Parkinson was born in Massachusetts. He worked as a civil engineer in San Francisco and Oakland in the 1860s and 1870s. He first appears in San Francisco directories as a Civil Engineer in 1865 and remains in subsequent directories until 1867. In 1871 he appears in Virginia City, Nevada. He is back in California in 1877, where he is named as a Civil Engineer in the Oakland Directory. In 1880, Parkinson was appointed Humboldt County Surveyor in Humboldt County, California. He became the manager of the Nevada Land and Cattle Company in 1888 and resigned in 1890 due to accusations of mismanagement and returned to the Bay Area. Several lawsuits, instigated by the investors in the Company and by Parkinson himself, dragged on through the U.S. court system for thirteen years, with one case being decided against Parkinson in 1903. In 1900 he is named in the Oakland Directory as a 'landholder.' He died in San Mateo in 1906.

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