Ideally, this should begin with smarter recruitment – to identify someone with problematic tendencies before they ever reach a position where they could wreak damage. And simply practicing due diligence with references and background checks would be an excellent start, says Ian MacRae, a psychologist and author of the forthcoming book Dark Social: Understanding the Dark Side of Work, Personality and Social Media. “I"m still astonished at how often people skip over this for senior positions – especially when the candidate is very charming.”