He was educated at Budapest, where his remarkable eloquence made him the leader of all student movements during his university career.

He aroused a national sentiment against dueling, his success being proved by the numerous anti-dueling clubs in Hungary.

In 1900, he established the political weekly "Új Század" ("The New Century") for the dissemination of democratic ideas throughout the country.

In 1901, Vázsonyi was elected deputy for the sixth district of the capital, on a democratic platform, of which he was the only public representative in the Hungarian Parliament as of 1906.

Vázsonyi died on 1 June 1926 from cardiac arrest, after injuries suffered in an assault by Ferenc Gyulai Molnár and the notorious anti-Semite Lászlo Vannay, described as "Ford's protege".