John Michael Tatum is the voice actor of Klein Sieben in RWBY.[1]
J. Michael Tatum is a well-known actor in various fields of entertainment. He is well known for voicing Sebastian Michaelis from the Black Butler franchise. Some of his other roles include Scar in Fullmetal Alchemist: Brotherhood, Erwin Smith in Attack on Titan, Tenya Iida in My Hero Academia and Sir Hammerlock in the Borderlands series.
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