As a leader, it's important not to wear your heart on your sleeve, writes Shawn Graham. No matter how extroverted you normally are, learn to maintain an even keel so that you can think about a situation rather than responding reflexively. "Learning how to effectively mask your emotions isn't something you can easily learn in business school," Graham warns. "As a new leader, it's critically important for you to develop your poker face as soon as possible."

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