Photograph 1 (studio portrait)
Photograph 2 (1968)
Photograph 3 (1992)

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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 7.06 inches wide by 8.97 inches high.

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Photograph with color-separation guide
Photograph by Professor George M. Bergman, Department of Mathematics, UC Berkeley. Date: June 29, 1980. Used by permission. Original photograph 4.63 inches wide by 2.88 inches high.

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Photograph with color-separation guide
Photograph by Professor George M. Bergman, Department of Mathematics, UC Berkeley. Date: August 11, 1992. Used by permission. Original photograph 5 inches wide by 3.5 inches high.