Rand Aldo Leopold, often referred to as the father of wildlife conservation, was one of the first forest rangers to whom Gifford Pinchot sent a request for narratives. On January 4, 1940, Leopold responded to Pinchot that he would be pleased to send an account of his work with the Forest Service but that his contribution would likely be "on the critical side." Leopold served from 1909-1933 in Arizona, New Mexico and Wisconsin. He went on to become the author of "A Sand County Almanac," arguably one of the best-loved classics of American environmental literature. He was thought of as a "prophet" by the author Wallace Stegner.
In his January, 1940 letter to Gifford Pinchot, Leopold praised his Old Chief's call for narratives but thought "...a generation or two must elapse before its value can be truly weighed by anyone."
For more on the correspondence between Aldo Leopold and Gifford Pinchot, please see "Gifford Pinchot and the Old Timers," page 145-149.