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Lloyd Alexander Jeffress (November 15, 1900 – April 2, 1986) was an acoustical scientist, a professor of experimental psychology at the University of Texas at Austin, and a developer of mine-hunting models for the US Navy during World War II and after, Jeffress was known to psychologists for his pioneering research on auditory masking in psychoacoustics, his stimulus-oriented approach to signal-detection theory in psychophysics, and his "ingenious" electronic and mathematical models of the auditory process.Jeffress received the first-ever silver medal in Psychological and Physiological Acoustics from the Acoustical Society of America in 1977 for "extensive contributions in psychoacoustics, particularly binaural hearing, and for the example he has set as a teacher and scholar."