Harold Conway
A tax accountant living in Japan who somehow managed to play in multiple movies over a span of 20 years, speaking both English and Japanese as the occasion required. He is best remembered in Japan for his role in The Mysterians (1957) as Dr. DeGracia, the creator of the Markalite FAHPs used against the titular aliens; apparently his Japanese in that role, delivered with the appropriate theatricality, was considered impressive for a non-Japanese speaking actor.