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

Angela Merkel, Piotr Poroshenko, François Hollande, Vladímir Putin y Frank-Walter Steinmeier, en una reunión en Berlín para tratar la situación en el este de Ucrania, el 19 de octubre de 2016

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.