Egbert Starr Newbury (September 8, 1843 – February 10, 1880) was the founder of Newbury Park, California, and the first newspaper reporter in the Conejo Valley.
He was the first postmaster in the Conejo Valley, and established the Newbury Park Post Office in 1875.
He was one of the three first to purchase Rancho El Conejo land in the Conejo Valley, and he may have built the valley's first cottage.Born in Michigan, Newbury traveled to California due to health reasons in 1871.
He bought 2,200 acres in the Conejo Valley in 1874, on land which stretched from today’s old town Thousand Oaks and into southern Newbury Park.
He left Newbury Park after the drought of 1877, and ultimately moved back to Michigan where he resided in Detroit.
Besides the town of Newbury Park and its post office, Newbury Road is also named after E.S.
Newbury.A replica of Newbury's home is located at the Tri-Village at the Stagecoach Inn museum in Newbury Park.Newbury was a Republican and a member of the Presbyterian Church.