Journalist, writer and former presidential spokesman, Olusegun Adeniyi is a Fellow of the Nigerian Academy of Letters (FNAL) who has delivered speeches and lectures in several countries. He has also written several books, including 'The Last 100 Days of Abacha', 'Power, Politics and Death: A front-row account of Nigeria under the late President Yar'Adua', 'Against The Run of Play: How an incumbent president was defeated in Nigeria' 'From Frying Pan to Fire: How African migrants risk everything in their futile search for a better life in Europe' and 'Naked Abuse: Sex for Grades in African Universities.'

A founding member of the National Stakeholder Working Group of the Nigeria Extractive Industry Transparency Initiative (NEITI), Fellow of the Nigeria Institute for International Affairs (NIIA) and member of the Kashim Ibrahim Foundation (KIF) Board, Adeniyi served on the Panel of Judges for the Nigeria Breweries Plc 'Maltina Teacher of the Year' for 2015 and 2016. He is also a member of the Leadership Council of the Africa Initiative for Governance (AIG) which awards annual scholarships and fellowships to Nigerians and Ghanaians for master's degree programme at the Blavatnik School of Government, Oxford University. In April 2019, Adeniyi was inaugurated, along with others from 29 countries, as a Council Member of the Belt and Road News Network (BRNN) in Beijing, China.

Adeniyi holds a first degree in International Relations from Obafemi Awolowo University, Ile-Ife and a master's in international law and diplomacy (MILD) from the University of Lagos. He has also participated in several professional and academic programmes in many countries. Notably, in July 2007, he attended the International Visitor Leadership Programme organised by the US State Department in Washington. He also spent the 2010/2011 academic session as a Fellow at the Weatherhead Centre for International Affairs, Harvard University where he conducted his research on the factors that shape incumbent presidential elections in Africa.

Married with three children, Adeniyi is currently the Chairman of the Editorial Board of THISDAY Newspapers where he writes a weekly column, 'The Verdict'.