–With his student, Andre Petermann, he invented 1951 the renormalization group, which is now essential to the construction of grand unified theories, and for which Kenneth Wilson later won a physics Nobel Prize.
–He predicted the first of the hundreds of subatomic particles discovered shortly before and after the war (World War II – the pion), but did not publish the idea after Pauli told him it was ridiculous. Later, the Japanese physicist Hideki Yukawa received a Nobel Prize for this idea.
–He pointed out in 1941 that pair production could be described classically by considering positrons as electrons running backwards in time.
–He illustrated these concepts with graphs of space-time trajectories similar to the diagrams Feynman began drawing in the summer of 1947.
Y finalmente, para redondear la desgracia (pero ¿qué se podía esperar después de lo anterior?):
When he became older, Stueckelberg was increasingly mentally disordered. He had a dog which attended his lectures, and when Stueckelberg ran into difficulties performing his calculations on the blackboard, he began to discuss the subject with his dog. He was treated later with electroshocks, which was a very popular method in psychiatry at that time. It was a very sad story.