William Marcus "Mark" West was a Scottish American pioneer who settled in what is now eastern Sonoma County, California, United States.
West came to the area in 1832, soon after marrying Guadalupe Vasquez, a sister of General Vallejo.
In 1840, he acquired the 6,663-acre (26.96 km2) Rancho San Miguel, located north of Santa Rosa Creek.
[1] Maria Francisca Guadalupe Vasquez y Lugo, who was the daughter of Felipe Vasquez y and Nicanor Lugo, married Mark West at the Mission San Carlos Boromeo in 1834.
She was the granddaughter of Juan Athanasio Vasquez, who was a soldier in the Anza 1776 Expedition.