He doesn't need to sue. If his story is correct he has a large amount of leverage in a negotiation and just needs to use it. 1. He is a high performer and is s

He doesn't need to sue. If his story is correct he has a large amount of leverage in a negotiation and just needs to use it. 1. He is a high performer and is solely responsible for at least one project of consequence. 2. His productivity numbers are at the top for his colleagues. 3. There are a number of things that will fall over if he is no longer there. Right now the company is picking and choosing how they treat him because they think they can. All he has to do is get another offer of employment and tell them about it. Either they will renegotiate the contract under more favorable terms to retain him. Or he will find employment at a better company where he is valued for what he is actually worth. The company he's at now think they don't need to take any action because they believe he isn't a flight risk. Change that perception and things will be very different.