In the early 70s I entered the Physics Department of the Research and Advanced Studies Center (CINVESTAV) in Mexico City.
Professor Mumtaz Zaidi received a PhD degree, working with Edwin Salpeter in 1960, on Lamb Shift Excitation Energy In the Ground State of The Helium Atom, from Cornell University. Professor Zaidi accepted me as a student at CINVESTAV. Professor Arnulfo Zepeda Domínguez, who still works at CINVESTAV, was recommended by Prof. Zaidi for a research stay at Rockefeller University. Zepeda worked with Heinz Pagels at Rockefeller. A few years later Seth Lloyd, from England, worked with Pagels as well.
Nowadays Zepeda works in Theoretical Physics, and Lloyd, now at MIT, does also.
I feel grateful to have known Zaidi and Zepeda personally. Zaidi taught me Statistical Mechanics, and Zepeda, Quantum Field Theory.
Currently I am working on the Foundations of Quantum Mechanics, following the discoveries of Seth Lloyd.