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Francis Hallé was born the April 15th 1938 with Seine-Port. It was initially monitor of veil to the Glénans before being graduate Sorbonne and university of Abidjan and becoming Botaniste and Biologiste.

Former Botanical Professor of to the University of Montpellier, he is specialist in the ecology wet tropical forests, architecture of the Arbre S, and large defender of the Forêt S primary (i.e. forests ever exploited by the man which would account for today only 5 to 10% of the forests of planet). He recalls that a secondary forest needs seven centuries to return in a primary education state and denounces the ecological disaster which the abusive Déforestation constitutes practiced by the great industry groups which one can already see the consequences in countries such as Haiti, the Nigeria, Madagascar or the Malaysia.

Of 1986 with 2003, it directed the scientific expeditions of the Radeau of the summits on the Canopée S of the tropical forests. He discovered that canopée is a paramount source of the Biological diversity.

In Éloge of the plant , it supports that the plants and the mankind are of nothing comparable. The plants appeared well before the men and the animals in general and they will certainly survive to them. Indeed, the animals (of which the man) need the plants to live (food, environment, etc) whereas the majority of the plants can do without the animals very well.

In its book Plea for the tree appeared in 2005, Francis Hallé presents all that the tree brings to the man and car the portrait of remarkable species like, for example, the Durian, the Eucalyptus or the Hévéa.