Happy Birthday, Alistair W. G. Cameron
Born on June 21, 1925 in Canada, he was one of the founding fathers of the field of Nuclear Astrophysics.
Completely independently of other researchers, he developed pioneering ideas and models for understanding the origin of the cosmic elements from which most of our current ideas concerning element formation followed. Most of these ideas were summarized in 1957 scientific article which appeared in parallel to, but completely independently from, a similar article by Burbidge, Burbidge, Fowler and Hoyle, a more widely known research group at that time.
Originally trained as a nuclear physicist, he made major contributions in a number of fields, including nuclear reactions in stars, nucleosynthesis, the abundances of the elements in the Solar System, and the origin of the Solar System and the Moon. Also particularly noteworthy is his explanation of the formation of the Moon caused by a gigantic collision between a sub-planet and the young Earth. This is the currently accepted model for the origin of the Moon.
He was a remarkable person in many respects, as can be seen from his life told in these publications:http://news.harvard.edu/gazette/story/2009/12/alastair-graham-walter-cameron/http://www.nature.com/nature/journal/v438/n7069/full/438752a.html
And as also told by himself:http://www.aip.org/history/ohilist/33763.html
(picture credit: http://pos.sissa.it/archive/conferences/028/205/NIC-IX_205.pdf