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Tom Mustaine is a game designer who has co-founded Ritual Entertainment and, after Ritual was bought by MumboJumbo, co-founded Escalation Studios. Escalation Studios was purchased by ZeniMax Media, parent company of Bethesda Softworks, in 2017. Escalation was made a part of Bethesda, becoming Bethesda Game Studios Dallas, at which Mustaine is currently an executive.