Lah was born in the village Štrukljeva vas near Cerknica, Austria-Hungary (now Slovenia).
In 1955 he discovered the Lah numbers.
Lah died in Ljubljana, Yugoslavia (now Slovenia).
External link Tomaž Pisanski on Lah at University of St. Andrews' pages: http://www-groups.dcs.st-and.ac.uk/~history/Mathematicians/Lah.html