Ivan Van Sertima
Ivan Gladstone Van Sertima (26 January 1935 – 25 May 2009) was a Guyanese-born British associate professor of Africana Studies at Rutgers University in the United States. He was best known for his Olmec alternative origin speculations, a brand of pre-Columbian contact theory, which he proposed in his book They Came Before Columbus (1976).