After his secondary education at the Chaptal high school, his father, who was a state railway engineer, pushed him to join the Central School of Arts and Manufactures ("Centrale"), one of the oldest and most prestigious engineering schools in France. At the same time he attended the cryptogamy laboratory of the National Museum of Natural History, he entered Centrale in 1920 and followed a course in chemical engineering, certainly because this path would enable him, once he had obtained his diploma, to take up the biology course. He became secretary of the Botanical Society of France in 1922, and graduated from the Ecole Centrale in 1923. Once his father's requirements were met, he returned to his original vocation and obtained a degree in natural sciences in 1924. He then became curator at the Institut botanique du Lautaret. From 1926 onwards, he was in charge of a series of botanical missions that would take him throughout Europe and Africa.
After a stint at the Pasteur Institute, Roger Heim became assistant to Professor Louis Mangin, holder of the chair of cryptogamy at the National Museum of Natural History, and in 1931 he defended a doctoral thesis on the Inocybe genus. In 1933, he was appointed deputy director of the National Museum of Natural History cryptogamy laboratory. In 1936, he created the Revue de mycologie. President of the Society of Plant Pathology and Agricultural Entomology of France in 1936, he was appointed Secretary of the National Committee for the Protection of Nature in the Overseas Territories of France in 1938. He developed an interest in tropical mycology, tropical plant pathology and termite mound fungi in Black Africa. At that time he started to issue his first exsiccata series under the title Cryptogames de l'empire colonial Français. Champignons. Séries A.[2]
When the Second World War broke out, Roger Heim joined the resistance. Denounced, he was deported to the Buchenwald concentration camp in Germany, then to the Mauthausen concentration camp and then to the Gusen concentration camp in Austria, where he endured fourteen months of cruelty. He went on to become the director of the French National Museum of Natural History, a post he held from 1951 to 1965. He involved the Museum in the conservation of nature, as he was a precursor about the environmental concern while, at this time, most of the biologists only cared about science but not about the biodiversity loss. In this period of time, he presided the 8th International Botanical Congress held in Paris in 1954. He was President of IUCN, the International Union for Conservation of Nature, from 1954 to 1958.[3]
Among the many awards Heim received in his lifetime, he was a Grand Officier de la Légion d'Honneur and Commandeur de l'Ordre des Arts et des Lettres.
Heim studied with ethnomycologist R. Gordon Wasson in Mexico, where he collected and identified various species of family Strophariaceae and genusPsilocybe. Heim was able to later cultivate most of the hallucinogenic mushroom in his laboratory.[4]Albert HofmannatSandoz LaboratoriesinBasel, Switzerland, later isolated and characterized the compounds psilocybin and psilocin.
He was also a member of the French Académie d'agriculture and the Académie d'architecture.
Heim R, Brack A, Kobel H, Hofmann A, Cailleux R. (1958). Déterminisme de la formation des carpophores et des sclèrotes dans la culture du Psilocybe mexicana Heim, Agaric hallucinogène du Mexique, et mise en évidence de la psilocybine et de la psilocin. Compt. rend. Acad. Sc. 246: 1346-1351.
Heim R, Hofmann A. (1958). Isolement de la Psilocybine à partir du Stropharia cubensis Earle et d'autres espèces de champignons hallucinogènes mexicains appartenant au genre Psilocybe. Compt. rend. Acad. sc. 247: 557-561.
Delay J, Pichot P, Lempérière T, Nicolas-Charles P, Heim R. (1958). Effets psycho-physiologiques de la Psilocybine. Comptes rendus des séances de l'Académie des Sciences. 247: 1235-1238.
Hofmann A, Heim R, Brack A, Kobel H. (1958). Psilocybin ein psychotroper Wirkstoff aus dem mexikanischen Rauschpilz. Rev. Mycologie. 22: 17-21.
Hofmann A, Heim R, Brack A, Kobel H. (1958). La Psilocybine, Principe Actif Psychotrope Extrait Du Champignon Hallucinogène: Psilocybe mexicana Heim. Les champignons hallucinogènes du Mexique. p. 255-257.
Heim R, Brack A, Kobel H, Hofmann A, Cailleux R. (1958). Déterminisme de la formation des carpophores et des sclérotes dans la culture du Psilocybe mexicana Heim, Agaric hallucinogène du Mexique, et mise en évidence de la psilocybine et de la psilocine. Rev. Mycologie. 22: 9-16.
Heim R, Brack A, Kobel H, Hofmann A, Cailleux R. (1958). Déterminisme de la formation des carpophores, et éventuellement des sclérotes, dans les cultures des agarics hallucinogènes du Mexique et mise en évidence de la psilocybine et de la psilocine. Let champignons hallucinogènes du Mexique. p. 247-254.
Heim R, Hofmann A. (1958). Isolement de la psilocybine à partir du Stropharia cubensis Earler et d'autres espèces de champignons hallucinogènes mexicains appartenant au genre Psilocybe. Rev. Mycologie. 22: 24-28.
Hofmann A, Heim R, Brack A, Kobel H, Frey A, Ott H, Petrzilka T, Troxler F. (1959). Psilocybin und Psilocin, zwei psychotrope Wirkstoffe aus mexikanischen Rauschpilzen. Helv. chim. Acta. 42: 1557-1572.
Ola'h, G-M, Heim RM. (1968). Etude Chimiotaxinomique sur les Panaeolus. Recherches sur la présence des corps indoliques psychotropes dans ces champignons”. Comptes Rendus Acad. Sc. 267: 1369-1372.
