In his career, he published over 560 articles, scientific reviews, and major works in fields like botany, chemistry, education, forestry, horticulture, liberal arts, medicine and zoology.

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.

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.

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.

Heim studied with ethnomycologist R. Gordon Wasson in Mexico, where he collected and identified various species of family Strophariaceae and genus Psilocybe.

[4] Albert Hofmann at Sandoz Laboratories in Basel, Switzerland, later isolated and characterized the compounds psilocybin and psilocin.