Frank W. Preston (May 14, 1896 – March 1, 1989) was an English-American engineer, ecologist, and conservationist. He helped found the Western Pennsylvania Conservancy and worked to reclaim the land that is now Moraine State Park in Butler County, Pennsylvania, in the United States. Preston was a leading expert in glass technology. He studied birds throughout his life and published papers on the shapes and pigmentation of birds eggs, the distribution of the heights of their nests and their migration patterns. Preston also wrote three major papers on the mathematical characteristics of ecological rarity and commonness. Biography Early life Frank W. Preston was born on May 14, 1896 in Leicester, England. He received three degrees from the University of London upon graduation in 1916. Following his college years, Preston worked as a civil engineer in Loughborough, England. He was drafted into the British Army during World War I but received a maximum exemption through the efforts of his employer. Preston was personally against the exemption and wrote the draft board in 1917 stating a desire to serve "in anything useful and suggested a brief exemption." Preston first traveled to the United States in 1920. His employer, William Taylor, sent him to Rochester, New York to work with George Eastman of Eastman Kodak. Taylor had developed a lens polishing machine that Eastman was interested in using for his camera manufacturing business. Preston returned to England and earned a Ph.D. at London University in 1925. He returned to the United States the following year and established Preston Laboratories in 1926 or 1927 in Butler. Work with glass Frank W. Preston's "day job" centered around his business, Preston Laboratories, where he researched glass. He became known as a troubleshooter for glass companies like Corning Incorporated. He invented a glass-melting furnace that allowed Corning Glass to create its line of Corelle glassware. Work as a conservationist Preston Laboratories was located first in Butler, then later moved to Meridian, Pennsylvania. Meridian is just south of the Muddy Creek and Slippery Rock Creek valleys. These valleys are where Preston began his work as a conservationist. Preston walked throughout the valleys and mapped their geological and geographic attributes. He discovered glacial erratics, kettle hole bogs and figured out how the mammoths and mastodons migrated through the area during the ice ages. On a trip to the Muddy Creek Valley he noticed that despite the barren landscape that