An early developer of CAD software at Calma, Mark went into business with Tom Hedges and later John Derry to create ImageStudio, ColorStudio, and Painter, the industry-standard natural-media painting application. Living with his family on Monterey bay, he now works at Apple on "pictures". His hand-illustrated blog covers the subjects of creativity, Painter, Fractal Design, the future, illustration, modes of thought, and three-dimensional design.