O'Donnel: http://www.youtube.com/watch?v=SRA3gdvUfpI
Zimmer: http://www.youtube.com/watch?v=Z0kGAz6HYM8
O'Donnel did Halo up until Reach and Zimmer did MW2 and MW
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Neither. Thomas Bergersen and Nick Phoenix. Although, in all honesty, they're all great.