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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.

Volcanism, impacts and mass extinctions (short, print version) Professor Gerta Keller et al.* survey the state of mass extinction studies, over 30 years since Walter and Luis Alvarez, Frank Asaro and Helen Michel discovered the KT impact.

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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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.

Luis Alvarez: Renaissance man. Polymath. Inspiration. Doer of amazing things. Very smily guy. Seriously, he is so happy! Which he should be. Because his accomplishments are amazing. It’s nice to find heroes in unexpected places … http://en.wikipedia.org/wiki/Luis_Walter_Alvarez

Luis Walter Alvarez - Wikipedia, the free encyclopedia.He is the young fella next to Arthur Compton on the left.

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