Dear Jake,

I just wanted to write you a note to tell you how much I've appreciated everything you've done for me. You were willing to take a chance on me when others wouldn't, due to my inexperience. Not only that, but you stuck by me as I learned and made mistakes.

I'm happy that you've found a new position with greater responsibilities. You deserve it. But I'm sad to see you go. You were more than a boss to me; you were a mentor and a friend. I will always value your advice and will …