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Harry Nyquist (1889-1976) was a notable engineer and physicist whose work significantly influenced the fields of communication theory, control systems, and signal processing. He is best known for the Nyquist theorem, which addresses the sampling of signals and is foundational in the field of digital communications. The Nyquist theorem states that to accurately reconstruct a continuous signal without loss of information, it must be sampled at least at twice the highest frequency present in the signal.