From this paper André Neveu and John Schwarz developed a string theory with both fermions and bosons.
Fermions are particles which have half integer spin (1/2, 3/2, 5/2 and so on, multiplied by the reduced Planck constant), and bosons are particles which have integer spin (0, 1, 2 and so on, multiplied by the reduced Planck constant).
Ramond completed the theory by inventing a fermionic string to accompany the bosonic ones.
In 1979, with Murray Gell-Mann and Richard Slansky he proposed the seesaw mechanism which explains small neutrino masses in the context of Grand-Unified theories.
In 2020, with André Neveu and Miguel Virasoro, he was jointly awarded the Dirac Medal of the ICTP for their pioneering contributions to the inception and formulation of string theory.
[6] In addition, Ramond has played an active role in service to his profession as a scientist and educator.