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Walter Alvarez is a professor in the Earth and Planetary Science department at the University of California, Berkeley. He is most widely known for the theory that dinosaurs were killed by an asteroid impact, developed in collaboration with his father, Nobel Prize winning physicist Luis Alvarez.

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Luis Walter Alvarez, born in San Francisco, invented a radio distance and direction indicator. His research resulted in a major revision of nuclear theories.

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Luis Walter Alvarez 1968 Born: 13 June 1911, San Francisco, CA, USA Died: 1 September 1988, Berkeley, CA, USA Affiliation at the time of the award: University of California, Berkeley, CA, USA Prize motivation: "for his decisive contributions to elementary particle physics, in particular the discovery of a large number of resonance states, made possible through his development of the technique of using hydrogen bubble chamber and data analysis" Field: Particle physics

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1923 self-portrait by Mabel Alvarez (1891-1985), aunt of Luis Walter Alvarez (1911-88), winner of the Nobel Prize for Physics in 1968. Mabel Alvarez has also been associated with the California Impressionism school, though she did few or no landscape paintings. She is better classed with the Group of Eight, southern California artists who maintained an association from 1921 till 1928.

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This photo shows from left Helen Michel, Frank Asaro, Walter Alvarez and Luis Alvarez, co-authors of a seminal paper in 1980 on what killed the dinosaurs.

Alvarez Hypothesis: Origin and Evidence Parrish illustration of asteroid blastIn the late 1970's geologist Walter Alvarez, and his father, Nobel-prize winning physicist Luis Alvarez, identified an unusual clay layer at the K/T boundary in Italy