Founder and pres­i­dent of Yahad-In Unum, orga­ni­za­tion ded­i­cat­ed to doc­u­ment­ing the evi­dence of the ​“Holo­caust by Bul­lets.” Bra­man Endowed Pro­fes­sor of the Prac­tice of Foren­sic Study of the Holo­caust at the Cen­ter for Jew­ish Civ­i­liza­tion of George­town Uni­ver­si­ty. Author of two books about the Holo­caust by Bul­lets. Human-rights activist. For the last sev­er­al years, he has been inves­ti­gat­ing the Yazi­di genocide.