When General Harry C. Trexler (1854-1933) established the Preserve in the early 1900s, he did it to save the American bison, elk, and white tailed deer from extinction and assure the species' survival. A conservationist along the lines of Theodore Roosevelt and John Muir, Trexler understood the importance of nature and preserving wildlife in its natural habitat.
A successful businessman who amassed a fortune in the timber and cement industries and founded the Pennsylvania Power and Light Company, Trexler began purchasing small farms in the low hills of Lehigh County in 1906. By 1913, he had transported eight bison and twenty white tailed deer to the Preserve. The elk followed soonafter. When he died, he bequesthed the preserve to the residents of Lehigh County. Today, the Trexler Nature Preserve is open to the public for recreation and nature watching.
General Trexler expressed his satisfaction in establishing the Game Preserve by stating: "If a trip through my preserve has opened to you a little wider the great outdoors, and nature has revealed something you may not before have seen or known, I shall feel repaid in my efforts to help conserve in its proper setting some of our wildlife."