From 1984, he studied at the Law Faculty of Vilnius University.
His business was focused on running radio stations and a national television network LNK which he sold in 1998. Hubertas Grušnys owned three national and two regional radio stations in Lithuania. He was also vice-president of the Lithuanian Association of Broadcasters.
He died in a private plane crash near the Pociūnai Airport, Prienai.