Escher dice
Myth of the squirrel proof feeder
Flower by Yuan Zhang
Black rat snake, Durham, June 2013
Azalea in backyard, Durham, March 2013
Sophie Gromoll, Charlottesville, November 2012
Hiking in Banff with Ed Perkins and Nathanael Berestycki
Durham house before we moved in
House in Ithaca Feb 27, 2010
Raccoon on suet feeder in Ithaca
Turkeys in tree in Ithaca.
View of backyard, Ithaca.
Signing the book, NAS induction April 2008
Snow on April 17, 2006 in Ithaca