The original photo appeared in the February 16, 1955 edition of the Petaluma Argus Courier with the following caption: "Santa Rosa bound - Al Vietheer, one of the several drivers employed by the Petaluma Co-Operative Creamery, gets ready to board his truck, just loaded with dairy products for Santa Rosa. The local creamery has built up a considerable trade at the county seat, and maintains a plant there for milk processing. Butter and cottage cheese are supplied from the plant here on Western Avenue."
Using Ancestry.com and other resources available at the Sonoma County History and Genealogy Library I discovered that Albert Clarence Vietheer was born in Petaluma in October of 1925 and was the son of Albert and Myrtle Vietheer. Albert, Sr. owned Al's Paint Store which was located at 140 Main Street. Albert, Jr. lived with his parents and two sisters: Arleen and Gladys at 832 Western Avenue.
After serving in the U.S. Navy as a seamen during World War II, Albert, Jr. returned to Petaluma, married Marileigh Runge and secured a job at the Petaluma Cooperative Creamery where he would work for the next 40 years.
Albert surely witnessed a lot of change in the dairy industry during his time with the Creamery. Perhaps someone took down his story?