Elie Wiesel, Nobel Peace Prize, 1986 - How can i contact him?

Hi,

Does anyone know how i can contact Elie Wiesel.
My late grandfather Hillel Schwartz and Elie Wiesel were in the same block house in Mauthausen.
My late grandfather Hillel brother in law Avrohom Sholom Yeshaya Segal Wiesel was a first cousin once removed of Elie.
I would assume Hillel and Elie knew each other in the camps and would like to hear about it.

Thanks,