Johnston was born in New York into an affluent banking family, which subsequently moved to Mount Vernon, New York. Initially he studied painting and illustration at the National Academy of Design in New York, but after graduating in 1908 (and marrying fellow student Doris Gernon the next year), his subsequent efforts to earn a living as a portrait painter did not meet with success. Instead, reportedly at the suggestion of longtime family friend and famed illustrator Charles Dana Gibson, he started to employ the camera previously used to record his painting subjects as his basic creative medium.
In approximately 1917, Johnston was hired by famed New York City live-theater showman and producer Florenz Ziegfeld as a contracted photographer, and was affiliated with the Ziegfeld Follies for the next fifteen years or so.
Source: Wikipedia
