Below is a link to a huge database of oral interviews that have been transcribed for the Smithsonian Archives of American Art.  Hundreds, if not thousands of artists’ interviews can be found here – from architects, painters, sculptors, photographers – everything design.

http://www.aaa.si.edu/collections/interviews

Here are some interesting artists:

Donald Judd (sculptor)

Ray Kaiser Eames (designer, wife of Charles Eames)

Isamu Noguchi (sculptor, furniture designer)

Dorothea Lange (photographer)

Julius Schulman (photographer)