[2] Lantos spent much of his childhood in Montevideo, Uruguay, where his family fled after the Hungarian Revolution of 1956.

He later started a production company, RSL Entertainment, which produced fifteen films, most notably George Kaczender's In Praise of Older Women and Ted Kotcheff's Joshua Then and Now.

[1] Lantos co-founded the Canadian film and television company Alliance Communications Corporation with partners Victory Loewy, John Kemeny, Stephen J. Roth, and Denis Héroux.

His television credits include the drama series: Due South, Power Play, North of 60, Counterstrike, E.N.G, Night Heat, Bordertown, and 25 made-for-television movies.

Lantos is a member of the Order of Canada[1] and holds an honorary Doctor of Letters from McGill University.