Giorgio A. Tsoukalos

Giorgio A. Tsoukalos (/ˈsuːkələs/; Greek: Γεώργιος Τσούκαλος; born March 14, 1978) is a Swiss-born writer, and television presenter and producer. He is a ufologist and a promoter of the ancient astronauts hypothesis. He is best known for his appearances on Ancient Aliens, a History Channel series of which he is also producer.