A tax accountant living in Japan who somehow managed to play in multiple films 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.

Conway appeared with other English speaking actors in scenes filmed for Godzilla vs. the Thing (1964) that were not included in the original Japanese version, but were shown in other English speaking markets.