He gave no reason for his departure -- but indicated he has no firm future plans.
His farewell E-Mail to Senate staff: "Dear Colleagues – Earlier today I informed Senator Lieberman of my resignation as his legislative director effective September 30. Serving the Senator, the state of Connecticut and the Senate itself has been the privilege of a lifetime – as has been the opportunity to work with all of you. The Senator, my colleagues on his staff and all of you have granted me an extraordinarily precious experience that I will treasure for the rest of my life. My future plans are still very much a work in progress, but I will count myself lucky indeed if, as I intend, they include our crossing paths again.
Again, thank you all for sharing the past three-and-a-half years with me."