The great scientist Freeman Dyson (Institute for Advanced Study, Princeton), passed away in 2020. Both my father and I have interacted with Dyson. For my recollections on Freeman Dyson, see my article “Dyson Remembrance“
Alladi’s Photos of Dyson

Freeman Dyson, and Mathura Alladi, at the
Alladi House in Gainesville during a party in honor
of Dyson – March 26, 2013.

Ramanujan Colloquium at the University of
Florida. George Andrews, the sponsor of this
Colloquium, is in the front row listening –
March 25, 2013

George Andrews, and Freeman Dyson, at the
Mathematics Department, University of Florida –
March 25, 2013.

George Andrews, Drew Sills, and Ae Ja Yee, on the
campus of the University of Florida – March 26, 2013

Krishna Alladi, George Andrews, and James Sellers,
on the campus of the University of Florida –
March 26, 2013

Number Theory Seminar talk at the University
of Florida – March 26, 2013
The August 2021 issue of the Notices of the American Mathematical Society contains a Memorial on Dyson with contributions from several eminent mathematicians and physicists. See PDF.
An abridged version of my Dyson Remembrance is included in the Memorial that appeared in the Notices of the AMS.