Yuval Noah Harari is an Israeli historian and a tenured professor in the Department of History at the Hebrew University of Jerusalem. He is the author of the international bestsellers Sapiens: A Brief History of Humankind and Homo Deus: A Brief History of Tomorrow . His writings examine concepts of free will, consciousness and definitions of intelligence.
Marion Shepilov Barry was an American politician who served as the second Mayor of the District of Columbia from 1979 to 1991, and again as the fourth mayor from 1995 to 1999. A Democrat, Barry had served three tenures on the Council of the District of Columbia, representing as an at-large member from 1975 to 1979 and in Ward 8 from 1993 to 1995, and again from 2005 to 2014. In the 1960s he was involved in the Civil Rights Movement, first as a member of the Nashville Student Movement and then serving as the first chairman of the Student Nonviolent Coordinating Committee .