 He served as a director of the Buenos Aires office of the Permanent Assembly for Human Rights from 2002 to 2004, and was President of the International Coalition of Historic Site Museums of Conscience.Timerman was the first witness to give testimony in the trial of Christian von Wernich, a former Buenos Aires Province Police chaplain convicted of complicity in numerous dictatorship-era murders and tortures (including that of his father).He published his observations on this issue in a 2005 book, "Torture".