He began his career in Czechoslovakia, where he was credited as "Jirí Pravda", and then emigrated to the United Kingdom. He then appeared in numerous British films and television series. His wife Hana Maria was also an actress.
His film credits include: Battle of the V-1 (1958, with Christopher Lee), Operation Amsterdam (1959), The Password Is Courage (1962), Thunderball (1965), Frankenstein Must Be Destroyed (1969), [The London Connection] (with Bernard Lee), Hanover Street (1979) and Firefox (1982).
Pravda's TV appearances include: No Hiding Place, The Avengers, The Saint, The Baron, The Prisoner, Special Branch, Department S, Callan, Softly, Softly,Doctor Who (in the serials The Enemy of the World, The Mutants and The Deadly Assassin), Doomwatch, Codename, Public Eye, Spy Trap,Moonbase 3, Colditz, I, Claudius, The Duchess of Duke Street, 1990, The Professionals, The Onedin Line, Tinker, Tailor, Soldier, Spy, Chessgameand Bulman.