ahava282
Here is a list but its certainly not everyone and if I skip anyone its not on purpose. Make sure you take along a translator who speaks Hebrew and Yiddish as well as English of course to translate for you unless you speak Hebrew well in which case you will possibly only need a Yiddish translator.
Rav Chaim Kannievsky
Rav Aharanon Leib Shteinman
Rabbi Wosner (Vosner)
Rabbi David Abuchatzeira
Rabbi Yaakov Meir Schechter
Rabbi Yakov Hillel
Rabbi Gamliel Rabinovitch
Rabbi Nissim Karelitz
Rabbi Ovadia Yosef
HaRav Shmuel Auerbach
Erlau Rebbe
Nadvorna Rebbe
Rav Yitzchok Scheiner