Rabbi Chaim Dalfin is a respected chasidic historian, mashpia and author of many books including The Real Shlomo, Satmar and Lubavitch, Rabbi Hutner and Rebbe and Lakewood and Lubavitch. His latest work is his book about Reb Yoel Kahan, Reb Yoel: The Rebbe's Chozer.
This book is available at www.rabbidalfin.com or emailing him at [email protected].