William Herbert Mortensen was an American glamour photographer, primarily known for his Hollywood portraits in the 1920s–1940s in the Pictorialist style.

Pictorialism is an international style and aesthetic movement that dominated photography during the later 19th and early 20th centuries. There is no standard definition of the term, but in general it refers to a style in which the photographer has somehow manipulated what would otherwise be a straightforward photograph as a means of creating an image rather than simply recording it. Typically, a pictorial photograph appears to lack a sharp focus, is printed in one or more colors other than black-and-white and may have visible brush strokes or other manipulation of the surface. For the pictorialist, a photograph, like a painting, drawing or engraving, was a way of projecting an emotional intent into the viewer's realm of imagination.