Witnesses included former President Alejandro Lanusse, writer Jorge Luis Borges, Estela Barnes de Carlotto, President of Grandmothers of the Plaza de Mayo; "Night of the Pencils" survivor Pablo Díaz; Patricia M. Derian, Assistant Secretary of State for Human Rights in the Carter Administration; Dutch jurist Theo van Boven, and renowned forensic anthropologist Clyde Snow.
Notable figures who testified included former President Alejandro Lanusse, acclaimed writer Jorge Luis Borges, Estela Barnes de Carlotto, leader of the Grandmothers of the Plaza de Mayo; Pablo Díaz, survivor of "Night of the Pencils"; Patricia M. Derian, a key figure in the Carter Administration's human rights efforts; Theo van Boven, a prominent Dutch jurist; and Clyde Snow, a renowned expert in forensic anthropology.