After becoming an important commercial and industrial photographer Korling went back to the subject of plant life for his third career his in old age. He lived long enough to reconcile his two passions, photographing indigenous plant life across the
Midwest and around the country while on corporate assignments. He published several books of his nature work that sold more than 100,000 copies over the last four decades. In his book
The boreal forest and borders, from nature he remembers as a boy bicycling to the edges of his town on the West coast of Sweden and rediscovering same forest's edge in North America where, he writes, “Natural vegetation everywhere has done considerable retreating in our lifetimes. This book, as will each one in the series,
Wild Plants In Flower, aims to provoke an appreciation for what remains, whether you can recollect what once was or not.” In Chicago on 20 acres near
Dundee, he designed an arboretum frequently used for his nature studies. He became well known in
Evanston during his last two decades. Korling died at Lakeshore Health Care and Rehabilitation Center in Chicago after a severe
stroke in the prior July, and was survived by his former wife, Diane Fawcett Korling; a son, Peter Felix Korling; and two daughters, Jenny Korling Nowlen and Annika Korling. He was remembered at a gathering at Bookman's Alley in Evanston which stocked his books. ==Publications==