He has illustrated over fifty books written by others and hasauthored and self-illustrated several books of his own, often studies of habitats. His favorite medium is pen and ink of subjects from the natural world.Many of his works have been separately published in limited edition as signed and numbered prints.

Other works include:

• 1991: Mountain
• 1973: The Great Fish
• 1986: Winter Barn
• 1988: Apple Tree
• 1990: Woodpile
• 1991: The Rock
• 1991: Marsh Cat
• 1993: Spaces

As illustrator

• 1974: Everybody Needs A Rock, illustrated by Peter Parnall; text: Byrd Baylor (Scribner) (Note: This was included as a promotional book in Cheerios boxes in 2007.)