Agree with everything that has been said but on the other hand...you have nothing to gain from this.It would be different if you were staying with your current firm. In that case, you would want to have your reputation 'restored' and make sure that other Directors don't get a bad impression of your work based on an unfair feedback.But you are leaving. This means they will probably dedicate 2 minutes to you in the review period (assuming there will be one before you leave) and the negative feedback will be forgotten by the following week - nobody will care. Also, it greatly diminishes any value they would give to your word or the importance of keeping you happy acting in a fair way (you are out of the door anyway - who do you think they will side with? The Director who is staying or the junior who is leaving?).I appreciate the personal element here - you have the perception of not having done anything wrong and it might be frustrating to let him get away with that but, ultimately, who cares? Pick a battle with the guy and you never know how this may bite you back one day - he may join your new firm or, more likely, he may know someone at the firm you are going to join, you may find him as a client...the world is a small place!Stay put, leave on good terms, discuss the feedback with him if you like but with a 'help me understand how to do better' attitude and keep his name written in big letters on your agenda - the world is a small place for him as much as it is for you. Who knows? You might be the one that bites him back 10 years down the line