In 1918 he finished his studies on Natural Science in the University of Barcelona, and in 1930, he got his graduation on Medicine and Surgery. He obtained his Ph.D. in the University of Madrid in 1922.

Botanist and historian of the Botany. He was graduated in Pharmacy in the University of Barcelona in 1927 and he got his PhD in Madrid in 1936. He was disciple of Antoni of Bolòs, Pius Font i Quer and Josep Cuatrecasas.

He was born in Torroella de Montgrí on December 1, 1812, the son of Jaume Giró and Úrsula Aranols. The couple lived in Torroella, where their father worked as a tailor, and later the whole family moved to Figueres, their mother’s hometown, where Andreu studied primary and secondary education.

He was teacher of zoology in the Museo Nacional de Ciencias Naturales in 1837; he became Professor of anatomy and physiology in the University of Madrid in 1843 and was one of the founders of the Société Entomologique of France.