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In 1948, Walter R. Evans gave engineers a new way to design for stability. Into Stability tells the story of his root locus method and its Spirule. Blending biography of the ingenious man behind them with engineering history, it shows how a practical tool influenced generations of engineers.

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Gregory W. Evans is an engineer, author, and historian whose work bridges technology, family legacy, and the human side of invention. A graduate of Caltech (B.S. 1969) and Stanford (M.S. 1975), Evans spent his career at the intersection of aerospace systems and defense electronics. His latest book, Into Stability: Walter R. Evans and the Story of Root Locus, celebrates the life and legacy of his father, Walter R. Evans-the engineer whose Root Locus Method transformed control-system design and became a cornerstone of modern engineering education. Drawing from decades of correspondence, laboratory reports, and family archives, Evans reconstructs the mid-century world of North American Aviation's Aerophysics Laboratory, where the foundations of modern feedback control were laid. Beyond chronicling a pivotal technical innovation, his earlier works include family and migration histories tracing his ancestors from Wales and England to the American Midwest, combining rigorous research with a storyteller's touch. Evans lives in California, where he continues to write, photograph, and preserve the stories of innovation that shaped both his family and his field.

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