Luis Walter Alvarez was an American experimental physicist, inventor, and professor who was awarded the Nobel Prize in Physics in 1968. The American Journal of Physics commented, "Luis Alvarez was one of the most brilliant and productive experimental physicists of the twentieth century."
1979: From excess traces of iridium in late Cretaceous rocks, American scientist Luis Walter Alvarez theorizes that a large comet or asteroid struck the earth 65 million years ago, raising clouds of dust that reduced the amount of solar radiation penetrating the atmosphere and triggering the mass extinctions of dinosaurs and other Mesozoic life. Luis and Walter Alvarez at the K-T Boundary in Gubbio, Italy, 1981.
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.