Background
Ugrenović was born in Petrinja (then Kingdom of Croatia-Slavonia).
Ugrenović was born in Petrinja (then Kingdom of Croatia-Slavonia).
He graduated from the Faculty of Forestry (1904) and the Faculty of Philosophy (1907) of the University of Zagreb.
In the 1907-1921 period he worked as a forester in Osijek, Slatina and Pakrac. Between 1921 and 1956, with a brief hiatus during the World World War II (1941-1945), he was a full-time professor at the Faculty of Agriculture and Forestry in Zagreb in "use of forests for trade and wood industry" and "forest politics". He joined JAZU in 1948.
Between 1925 and 1929 he edited Šumarski list (Forestry Magazine) and for a while also edited magazine Prirodoslovna istraživanja JA (Investigations of nature by the Yugoslav Academy).
He initiated and later became the editor in chief of the Forestry Encyclopedia of the Yugoslav Lexicographical Institute in Zagreb. Aleksandar Ugrenović died in Zagreb, at the time in Social Research Croatia.
He was also a member of the JAZU presidency, secretary of the Natural Science Department and the commissioner of the Forestry Section in the Yugoslav Academy. He was a member of several international forestry organizations, such as Silva Mediterranea (Rome, 1922), Commission internationale d"agriculture (Paris, 1923), Institut internationale d"agriculture (Rome, 1934), and Union internationale des instituts de recherches forestieres (Stockholm, 1936).