I have many opportunities of writing about A. D. in the traditional (and not fully traditional) forms of scientific publicism. I am happy that he never reproached me for this, and so I guess that I may skip the task of surveying his scientific contribution. Many events in which I observed A. D. and sometimes participated in secondary roles were not so long ago as to become an impartial history. Not all of them deserve inspecting over for revival and plunging into once again. Perusing my personal archives, I decided to select just a few items reflecting those traits of A. D.'s personality that were revealed in our contacts.
I will be glad if the lessons of A. D.'s life help someone to hold on or to settle some pending crisis as they have readily done for me...