Adnan Oktar, also known as Adnan Hoca or Harun Yahya, is a Turkish religious sex cult leader, creationist/anti-evolutionist, conspiracy theorist, preacher and pamphleteer. In the 2000s, he was engaged in "a massive campaign" of proselytizing" Westerners to Islam, producing dozens of cheap, short, vividly illustrated books in the languages of Europe and the Muslim world. As of March 2022, he is awaiting retrial on several sex and financial charges.