Please help! I'm losing sleep over this. Who is this Lubavitcher Chossid? Lubavitch Archives on Facebook also wants to know... Thank You and Good Day. UPDATE: It's הרה"ח ר' מיכאל קצנלנבויגן הי"ד, שנרצח ע"י הקאמוניסטען ביום כ"ב אלול תרצ"ח. Among his children are the Shliach Reb Schneur Zalman o"h, of Cleveland, and יבלחט"א Reb Moshe of London.