Photograph 1 (1964 studio portrait)
Photograph 2 (1968)
Photograph 3 (1974)

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Photograph with grayscale-separation guide
Above photograph copyright G. Paul Bishop, 1964. Courtesy of the Department of Mathematics, UC Berkeley. Used by permission. Original copy 7.15 inches wide, 8.97 inches high.

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Photograph with color-separation guide
Above photograph by Professor George M. Bergman, Department of Mathematics, UC Berkeley. Date: June 6, 1968. Used by permission. Original photograph 5 inches wide, 3.5 inches high.

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Photograph with color-separation guide
Above photograph by Professor George M. Bergman, 1974, Department of Mathematics, UC Berkeley. Date: August 20, 1974. Used by permission. Original photograph 4.97 inches wide, 3.47 inches high.