Yosef Yitzchak Shloush died in 1960.
Rabbi Jacobson was born June 11, 1972
Yes, and you can travel to them. They're located in Florida, Israel, Ukraine, and Russia.
Yitzchak Blazer died in 1907.
Yitzchak Lowy died in 1942.
Levi Yitzchak Horowitz died in 2009.
Levi Yitzchak Schneerson died in 1944.
Yitzchak Yaacov Reines died in 1915.
Avraham Yitzchak Bloch died in 1941.
Shmuel Yitzchak Hillman died in 1953.
Yosef Weitz died in 1972.
Yosef Alon died in 1973.
Yosef Porath died in 1996.