baruch-dayan-emet-rabbi-zecharia-shimon-hakohen-wallerstein-its-really-really-hard-to-write-his-name-after-bde.html
Zecharia Shimon Hakohen ben Tzirel
The message I received stated he is ill, but not in dire condition.
I owe a big debt to Rabbi Wallerstein because right at the time I felt pressured to go on Facebook (before other social media existed), he repeatedly spoke against Facebook, so I never opened up an account there nor went on any social media at all.
And it's only because of Rabbi Wallerstein.
May Hashem please send him a refuah shlaim u'meheirah b'toch sha'ar cholei Yisrael.