There is a video interview of Dr. Wesley Hanson available online. The address is:

Dr. Hanson got his Phd in chemistry when he was 21 years old and persistently applied to Kodak for a job until they finally hired him. He spent his whole career at Kodak, eventually becoming the director of research there. He knew the inventors of Kodachrome, Mannes and Godowsky, and observed them at work; he met George Eastman; and he himself is the inventor of built-in masks used in Kodacolor negatives.

Dr. Hanson is one of the great figures in the 20th Century photographic industry and this interview is quite fascinating for anyone interested in color film.