Born in 1957 in Maraş, Köker worked as a correspondent and editor for various daily newspapers and weekly magazines. He assumed editorial positions in a number of publishing houses, focusing on history publications.

In 2005, he established Birzamanlar Yayıncılık, which publishes books and organizes events as regards the now lost cultural diversity of Turkey and its disappearance.

He edited numerous books including the book and album “Armenians in Turkey 100 Years Ago” and curated scores of exhibitions such as “Sireli Yeghpayrs”, some of which went on tours overseas.