Guillemin and Andrew Schally discovered the structures of TRH and GnRH in separate laboratories. The process of this scientific discovery at Guillemin's laboratory is the subject of a study by Bruno Latour and Steve Woolgar, published as Laboratory Life.[2]
Guillemin signed along with other Nobel Prize winners a petition requesting a delegation of the Committee on the Rights of the Children of the United Nations to visit a Tibetan child who had been under house arrest in China since 1995, namely Gedhun Choekyi Nyima, recognized as the 11th Panchen Lama by the 14th Dalai Lama, Tenzin Gyatso.
Guillemin turned 100 on January 11, 2024,[3] and died in San Diego, California the following month, on February 21.[4][5]