A senior employee known as an aggressive workaholic, but who seems stressed, yet rarely takes vacations, declines promotions, and zealously protects his business unit from outside scrutiny while personally handling choice vendors may be up to something devious.

Sound like Jerome Kerviel, the former trader at Societe Generale in Paris, whose covered up trades led to the French bank losing $6 billion? He never took time off, which likely would have unraveled his bets.

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