The following is from a work-in-progress about the history of Fullerton. You can support my ongoing research and writing on Patreon.
Dallison Smith Linebarger was born in Oregon in 1862. When he was a child his family moved to California, and he was raised in Ventura County.
In 1899 he moved to Fullerton, and bought the livery stable of Thomas Jennings. With two partners he established the business under the name of Davis, Drown and Linebarger.
They also owned a stable at Olinda where they provided horse teams for the oil fields, hauling derricks and machinery.
According to biographer Samuel Armor, “Mr. Linebarger was general manager of the concern, which was conducted on an unusually large scale, using fifty head of horses, a large bus, and all the necessary equipment for the success of such an establishment.”
He was also a rancher, raising stock and grain in Los Angeles and Orange counties, also owning an orange grove.
In 1910, he sold out his interest in the livery business to devote his time to his 70-acre citrus ranch, which was between Fullerton and Brea.
Linebarger served for ten years as an Orange County supervisor, He was a Democrat in a strong Republican district.
“During his term of office the good roads movement was started, and many of the beautiful boulevards which have made Orange County famous were begun by the sale of bonds,” Armor writes.
He was married in 1882 to Ellen Stone. They had six children.
Linebarger was a member of the Fullerton Lodge of Odd Fellows.
Below is a photo of the Linebarger house. Located at the southwest corner of Pomona and Wilshire, this large Craftsman-style bungalow was built sometime around 1911. In 1917 he sold the house to Harold Walberg, head of the music departments at Fullerton High School and Fullerton Junior College, and director of the Orange County Symphony Orchestra. The City purchased the property, and the house was demolished in 1981 when the Wilshire public parking structure was built. The lot was developed into a downtown park to complement the plaza.

Source:
History of Orange County, California: with biographical sketches of the leading men and women of the county who have been identified with its earliest growth and development from the early days to the present by Samuel Armor. Los Angeles Historic Record Co, 1921.