Donald Marquardt

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Donald W. Marquardt (1929- 5 July 1997) was the rediscoverer of the Levenberg-Marquardt nonlinear least squares fitting algorithm.

Donald joined DuPont in 1953 and worked for 39 years. In 1963 he published his famous paper "algorithm for least-squares estimation of nonlinear problems" in SIAM journal. Donald developed his algorithm to solve fitting nonlinear chemical models to laboratory data. He also founded and managed the DuPont Quality Management & Technology Center.

In 1991, he established his own company, Donald W. Marquardt and Associates, which provides consulting and training in quality management, quality assurance, ISO 9000 standards, applied statistics, strategic planning and organizational change.

He died from a heart attack at the age of 68.

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