That would be Robert Wilson at the first successful explosion of a nuclear bomb, a plutonium one, at the Trinity test on the date in the title, about 120 miles south of Albuquerque, quite far from the Los Alamos site that Wilson oversaw the construction of, reportedly riding around on a horse to see that the sewer and electrical lines were properly installed, he being a native of Wyoming, unlike the majority of the Manhattan Project crowd, many of them Jewish refugees from large cities in Europe totally unable to deal with the American Southwest.
No, this is not the co-composer of the minimalist opera, "Einstein on the Beach," or the microeconomic theorist that some think should receive a Nobel Prize (forecast, no). This one built the Fermilab near Chicago as well as Los Alamos, and after the war attracted the largest group of Manhattan Project physicists to be with him at Cornell University, including Nobelist Hans Bethe as well as Richard Feynman, and many others. They respected him that much.
So indeed, he was the man who when the bomb went off did not join in with the others to drink champagne and celebrate their great achievement. It is true that his boss Oppenheimer expressed a complicated view, suggesting that what they had done was in honor of Shiva, the Hindu god of destruction and creation (how Schumpeterian), but he drank the champagne, even as he would later be deposed by McCarthyites for his leftist connections when it came to the matter of the H-bomb.
So, his oldest son and wife has been a serious conservative, voting GOP and quite critical of the political views of his left/progressive parents. However, last night I spoke with him and his wife, and this person acutely aware of nuclear weapons issues, the oldest son of the man who said that "We have done an evil thing" when the others were celebrating and drinking champagne, has, like many other serious Republicans, decided that Trump is completely unacceptable and irresponsible on the grounds of his completely ignorant and ridiculous remarks regarding nuclear weapons policy, which themselves have already degraded the peace of the world.