R' Alexander Ziskind ben R' Moshe of Horodna ZY"A, author of Yesod V'shoresh Ha'avoda. In his tzavah he says he will be a "good advocate" for all who learn his sefer, even if they don't take upon themselves anything he writes. R' Ahron of Karlin brought him to the Magid of Mezerich, but the Magid purposely was not mekarev him because he said R' Alexander was a pure tzadik and already set in his ways. Yesod V'shoresh Ha'avoda is used by Litvaks, Chasidim and Sfardim. It is brought down in Chaye Mohoran (Tzadik) that R' Nachman of Breslov praised him.
R' Chatzkel Levenstein, legendary mashgiach of Mir & Ponovezh (1974), R' Yechezkel ben R' Yehuda ZY"A.
R' Chanoch Henach ben R' Pinchos HaKohen of Alexander ZY"A(1870), direct descendant of the Shach. Talmid of the Yid Hakodosh and R' Bunim of Peshischa. Served as rebbe of the Gerer Chasidim for a while after the Chidushei HaRim died. Not to be confused with the Alexander Chasidim. he did not leave over a dynasty.
R' Nachum Mordechai ben R' Yisroel Friedman of Chortkov ZY"A (1946)