Barbara, I've tried writing letters and talking to him about the BIG picture and what he SHOULD be focusing on now, but he can be very single-minded in that he'll pick a "cause" and go for it with all his mental energy. It's trying to get that directed in a direction that will actually benefit him that has always been a challenge and continues to be now.
And, trust me, we will NOT go against the advice of his easy child and PO because they're the experts here, and I truly believe they have his best interest at heart, even if HE doesn't understand that...