Personal History of Michael Rosenbaum is unknown.
As an actor, Michael Rosenbaum took on a number of roles relating to adaptations of DC properties. Primary among these was voicing the Flash for the DC Animated Universe and appearing through out the majority of the 2001 through 2011 run Smallville as Lex Luthor. He also directed an episode of Smallville for the series' 6th season.
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