Kreh was born February 26, 1925, in
Frederick, Maryland, where he attended
Frederick High School. His parents were Theodore (aka "Whitey"), who died in a basketball accident when Kreh was eight; and Helen M. Purdy. His father taught him about fishing, and after he died Lefty would bring fish home for his mother and three siblings, Eileen, Dick and Teddy. Lefty served in the Battle of The Bulge. He said they barely ate, and always were cold. He was one of the men who helped to take the Ludendorff Bridge from the Germans in the Battle of Remagen. That battle and victory was a turning point in the European theatre for WW2. After serving in
World War II, Kreh was one of three US servicemen infected with anthrax, and the only one to survive. The strain he was infected with was named BVK-I as a result. He began fly-fishing in 1947 while serving as a guide for the famous fly fisherman
Joe Brooks. In 1965 he moved to
Miami, Florida, and became the Director of the Metropolitan Fishing Tournament. He wrote for various fishing magazines. He is known throughout to always throw his fish back, keeping the flow in the waters for more fish. He began to fish for saltwater species in the
Florida Keys. It was during this time that Kreh,
Joe Brooks, Al Pflueger, Tom McNally, George Hommel, Stu Apte and Bob Stearn's pioneered the techniques, deviating from the classic "Ten to Two" casting technique, that modern saltwater anglers use to pursue fish with fly fishing gear. == Career ==