Wilmington Gregg, son of Riley and Angeline Gregg, came to California as a young boy with his parents and brothers. They lived in Napa, where Wilmington became a printer and a writer. He moved to Vallejo for a time to start a newspaper with his brother's former business partner, Frank Leach. Leach wrote a book about his experiences, in which both Livingston and Wilmington Gregg were mentioned.

From Illustrated Atlas, history of Yolo County 1879 I2 p. 99 (San Francisco Main Library, Local History Room qc 979.451):

Gregg, W., a native of Missouri, born 1843; came to California in 1846, and lived in Napa county until 1871, when he settled in Yolo county. He is a printer by trade, and has followed that in conjunction with book-keeping. He was married to Ninnie T. Huston in 1870, in Lake county. Their children are: Ralph, seven; Edwin, five; Laura, two; Janet, four. Richard, aged two and a half years, died in 1873. Mr. Gregg's postoffice address is Knight's Landing.


Gold Rush Days, Vol. III, Miscellaneous Records 1856-1862 copied from early newspapers (Stockton, CA; compiled by San Joaquin Genealogical Society, 1982; Santa Cruz Library Genealogy Room. 979.4) reports: "January 9, 1858: Gregg, Wilmington, accidently killed William Stevenson."