Sedat Ergin was born in Istanbul in 1957 and completed his high school education at Robert College. Sedat Ergin, who completed his undergraduate education at Ankara University, Faculty of Political Sciences, Department of International Relations, started journalism in 1975 at the Turkish News Agency Foreign News Service. Between 1976 and 1978, he worked as Diplomacy, Prime Minister, and Parliament correspondent in the Turkish New Agency's Ankara Office. Between 1979-1987, he worked as a diplomacy correspondent in Cumhuriyet Newspaper Ankara office. Ergin moved to Hürriyet in 1987 and became the Washington correspondent of the newspaper. After serving in this position for nearly six years, he became the Ankara Representative of Hürriyet Newspaper in 1993. Ergin was in this position for 12 years, at the same time continued as a columnist, and regularly participated in the Ankara Backstage program at CNN-Türk. On 17 March 2005, he became the Editor-in-Chief of Milliyet. Sedat Ergin returned to Hürriyet in October 2009 as a columnist after his duty at Milliyet, and after working as a columnist for five years, he started to work as the Editor-in-Chief of the Newspaper on 25 August 2014.
Ergin won the Sedat Simavi Press Award twice, in 1997 for the series titled "Storm File", which talks about the collapse of the Welfare-Road government, and in 2003 for the series "Hidden from Us", in which he describes the process leading to the March 1 motion crisis. Moreover, Ergin, Turkey Journalists Association three-time winner of the journalism award, has been awarded the freedom of the press in 2010 by the Society of Journalists of Turkey. Ergin is married and speaks English.
Sedat Ergin left Hürriyet's Editor-in-Chief position in March 2017 and returned to be a columnist for the same newspaper.