MICHAEL D. WHEELER, MANAGING EDITOR, [email protected] Forty-seven years ago, a 13-year-old boy with a passion for astronomy was looking for information about testing his telescope design for aberrations. He wrote a letter to an up-and-coming optical lens design engineer working at GE, Bruce Walker, who shared his expertise in a series of letters over the years. Here, Walker and Rich Pfisterer — the teenager he mentored — share their recollections of that fateful correspondence. Pfisterer is president of Photon Engineering. Walker is planning to retire at the end of 2017 after a lengthy career in optical engineering and lens design....Read full articleRelated content from Photonics MediaARTICLESLooking Back: A Lens Designer RemembersNearly 57 years ago, in 1962, I began work as an optical engineer with General Electric (GE) in Scranton, Pa. 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