In his role, he is all too aware of the sensitivities in Jerusalem.
As well as its importance to Christians, the Old City is home to sites revered by Jews and Muslims. For decades it has been a focal point of the Israeli-Palestinian conflict.
"It's special to give the message of love and peace from Jerusalem -- it's the heart of the world," he told AFP at his grotto.
"When we have peace in Jerusalem, we will have peace in the world," added Kassissieh, who consciously avoids politics.
For the Jerusalem native, the secret to being a good Santa is simple.
It is "always, to have an answer to the children's questions," he said.
