Follow the money. The companies he buys products from have a vested interest in him getting a new job, so they start telling all their customers "Bill is a grea

Follow the money. The companies he buys products from have a vested interest in him getting a new job, so they start telling all their customers "Bill is a great CIO, he just left his current spot and is looking for a new job, you should definitely hire him as your CIO". And the cycle repeats. Also the people above the CIO will have a vested interest in covering up his transgressions, because it would reflect poorly on them. It's good work if you don't have a conscience.