I meet my guest, a former head of Mossad, at the Clonegal Castle restaurant in Dublin.
For a starter, I order Dublin Bay prawns with truffle sabayon and prawn bisque.
Reuben says the prawns may be radioactive and orders chopped herring fillet with pickled onion and salad in sour dressing.
Kennedy, Nixon, Reagan, Bush and a number of others.
William Casey, CIA Director 1981 - 1987
"William Casey set up the Jamestown Foundation," explains Reuben, "and we now know that Tamerlan Tsarnaev attended one of their workshops."
I suppose that is a Boston connection.
Reuben reminds me about Iran-Contra.
Just hours before Casey was due to give evidence before Congress about Iran-Contra, he was rushed off to hospital and mysteriously disappeared.
"The Irish," replies Reuben.
He explains that it was William Casey who organised the setting up of 'the mad Moslems' in Afghanistan.
George Tenet is a graduate of the Jesuit Georgetown University.
We pause our conversation as the waiter brings us our Tarte Tatin, pressed apple terrine and pain d‘épice ice cream.
He points out that Obama chose John Brennan, from Roscommon, to head the CIA.
"Brennan is going to retire to Ireland, according to his family," explains Reuben.
Over coffee, I bring up the subject of the USS Liberty.
"President Lyndon Johnson and the CIA could see that Nasser was increasingly pro-Soviet," says Reuben. "Johnson decided to topple Nasser. As part of Operation Cyanide, the USS LIBERTY was sent to operate off the Sinai coast, in order for it to be sunk."