Endorse it: Rabbi Zalman Nechemia Goldberg (Member, Beth Din of Yerushalayim)
Rabbi Yitzchok Liebes, zt”l (former Av Beth Din, Iggud HaRabbonim)
Rabbi Gedalia Dov Schwartz (Av Beth Din of the Beth Din of America)
Rabbi Osher Weiss (Rosh Kollel, Machon Minchas Osher L’Torah V’Horaah)
Rabbi Ovadia Yosef, zt"l (former Sephardic Chief Rabbi of Israel)
Rabbi Chaim Zimbalist (Member, Beth Din of Tel Aviv)
And a whole bunch of YU type rabbis
http://theprenup.org/pdf/YU_Roshei_Yeshiva_Prenup_Letter.pdfDon't endorse it: Everyone else. Believe me they tried to get mainstream support but couldn't
The Prenup was drafted by Rabbi Mordechai Willig, Sgan Av Beth Din of the Beth Din of America, and a Rosh Yeshiva at the Rabbi Isaac Elchanan Theological Seminary of Yeshiva University, in consultation with halachic and legal experts. The concepts contained in The Prenup predate
1994, when it was introduced.
I don't mean to disparage the above Rabbis, but none of the other Gedolim or Rabbanim in the world accept it.