Unfortunately, I am not able to attend personally to this sad event for the Professor who always had enormous excellences in his attitude towards me. I have greatly benefitted from his leadership and superb guidance for decades, including during our prion joint project with a successful outcome. Dave has put a memorable stamp of his greatness in my heart and mind. A rare example of a caring leader and will owe him plenty from here to eternity. With warmest personal greetings and condolences to his family, colleagues and close friends Jerard Seghatchian