James Jowers worked in New York City and lived on the Lower East Side about the time this photo was taken.
The Exhibition was open from February to December 1915 and celebrated the completion of the Panama Canal in 1914. It also showcased the city’s recovery from the devastating 1906 earthquake. Its palaces and halls were built on a 635-acre site along the city’s northern shore, between the Presidio and Fort Mason.
“Constructed from temporary materials (primarily staff, a combination of plaster and burlap fiber), almost all the fair’s various buildings and attractions were pulled down in late 1915,” according to Wikipedia.
Zoller was an American from Rochester, New York, who worked in the first decades of the 20th century. The George Eastman House holds almost 4,000 of his autochrome plates.
Another wonderful photo of (April 1945) pink is here.
I couldn’t find out anything about H. Wormleighton except that he or she was English and worked in the first three decades of the 20th century.