"In conversation, as with public speaking, Zimmerman's voice - slightly high-pitched with a hint of flamboyance - always seems to be the loudest in the room. When asked a question, he answers it fully, even if it takes 10 minutes. He rarely leaves gaps for interruption, and it never feels like he's blowing hot air.
'"The reason he is successful ... is that he's extremely comfortable thinking about things systematically,' Karen Sideman, a friend and former work associate of Zimmerman's, said. 'That's what game design is.'"
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