He is the co-founder (1974) of Perach, a national tutoring and mentoring project in which over 20,000 Israeli undergraduates receive a tuition fellowship in return for devoting four hours per week to a child from an underprivileged socioeconomic background. He also initiated and established in Tel Aviv (1988) a science teaching center "HEMDA", in which high school students perform all their physics studies in advanced laboratories and with highly qualified teachers, instead of pursuing the same in their own schools. Harari has been chairman of both projects, since their founding, until recently.