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He was born in Athens. He graduated from the University of Athens and studied journalism in Paris, Tokyo and India. He has worked as a political correspondent in Greece and as a foreign correspondent in Paris and Moscow, from where he covered developments in the Soviet Union and the other ex-communist countries. In the 1992-95 period he covered the war in Yugoslavia as a special war correspondent.
In 1996 Kouloglou created and introduced for the Greek national television Reportage Without Frontiers. His documentaries have won awards in Greece and abroad (2000 and 2001 "Euro-Comenius" historical documentary Award).
On November 1, 2008 he began an internet channel named "TV Without Frontiers", a news and political analysis website.
On May 12, 2008 the administration of ERT decided not to renew the cooperation with the journalist. As justification, they said that the emission had run its course. According to Kouloglou, the ERT administration had requested the cancellation of the broadcasting of his documentary show titled “Young Workers for 700 €”, while they also refused to cooperate in the organization of a documentary on human rights in China from Mao to the Olympic Games. The termination of his cooperation with ERT as a result of censorship has raised a solidarity movement in social media and many queries have been made from various deputies to the minister in charge.
In 2009, his documentary film Confessions of an Economic Hit Man, based on the book of the same name by John Perkins, was shown at film festivals in the U.S. and received awards in South Korea and Spain.
He has written books on current affairs and politics (Sta ihni tou Tritou Dromou, 1986 (On the footsteps of the "Third Road"), Mia fora ki enan kairo itan mia Sovietiki Enwsi, 1994 (Once upon a time there was a Soviet Union), Oi kokkinoi ksanarhontai, 1994 (The return of the Reds)), historical testimonies (Martyries gia ton Emfylio kai tin Elliniki Aristera, 2005 (Testimonies on the Civil War and the Greek Left)). He was voted “Writer of the year-2002” for his best selling novel 'Min pas pote monos sto tahydromeio'(“Never Go to the Post Office Alone”, 2002) which was a top best seller for the years 2002-3.
He is producer and director of numerous grand reportages and documentaries for ARTE, ERT, including «Whistleblowers»(2004). Among his documentaries stands out "Oligarchy" (2012) a documentary on the world financial crisis filmed in the US, Germany, Belgium, Great Britain, Spain, Portugal, Ecuador and Greece. «Holocaust of Memory»(2013), is a breathtaking documentary about personal testimonies on unreported nazi crimes in Greece. His documentary titled "The godmother" (2014) focuses on Angela Merkel and her strategy to impose German hegemony in Europe. His latest documentary "Escape from Amorgos" (2015) is a sensational story about the exiled politician Giorgos Mylonas and true face of the military dictatorship in Greece.
- "New ERT Board Announced". ERT (news.ert.gr). 2010-01-28. Retrieved 28 January 2010.[dead link]