The Turkish sociologist Ziya Gökalp (born Mehmed Ziya, 1876–1924) had a great influence on the establishment of modern Turkey as a secular state through his publishing activity. He rejected (pan-)Islamism and the Ottoman Empire and instead advocated Turkish nationalism.
Ziya Gökalp büstü, colour photography, 2011, photographer: Cemallamec; Bildquelle: Wikimedia Commons, https://commons.wikimedia.org/wiki/File:Ziya_G%C3%B6kalp_b%C3%BCst%C3%BC.jpg, Attribution-ShareAlike 3.0 Unported (CC BY-SA 3.0), https://creativecommons.org/licenses/by-sa/3.0/deed.en.