OTTO RAPP - INTERVIEW ON ILLUSTRATION TOOLBOX - January 2011
Originally published in Illustration Toolbox January 2011 by Brian Rhinehart - the original site does not exist anymore, the domain was sold and now is not related to art/illustration at all.
I re-published the following screenshot on my posterous blog June 8, 2012, only to find that posterous was discontinued at the end of April 2013. A copy of this posterous blog has now been published to my Blogger.
Interview - PDF document recreated from the screenshot: