After 20+ years negotiating at Fortune 500 companies, these are the five negotiation mistakes I see executives make most often and they're almost entirely avoidable. Here's what they are and how to fix them.

A professional negotiation consultant does something lawyers and coaches don't. They prepare you to win the deal in front of you, or sit at the table on your behalf. Here's exactly what they do, who needs one, and when to make the call.