Over the course of a long and prolific career, his work has explored intimacy all the while playing with scale, distance and subject. He has made aerial photographs of the landscape dramatically marked by natural and man-made phenomenon, and worked in places as diverse as the Czech Republic, Mexico, the Middle East, Japan and the United States. He has also made a study of insects, photographing intimate portraits of species both known and novel. In 1973 he began teaching at Princeton University where he worked for twenty-five years.