Thanks to his tours all over the world and his recognition by the audience as well as by the musical critics, Costas Cotsiolis is nowadays considered as one of the greatest guitarists of our time.

Costas Cotsiolis has been art director of the Volos International Guitar Festival since 1978 - since 2006 called the Naxos International Guitar Festival - , where more than 9000 students appeared as well as about 400 professors and soloist from all over the world. Many fabulous guitarists started their international career as young talents at this festival.

He's been professor of the Conservatory of Athens since 1977 and of the New Conservatory of Thessaloniki since 1981, creating an exemplary school of excellent guitarists who have been awarded all over the world and have international career.
For his activities, Costas Cotsiolis was awarded by the Academy of Sciences and Arts of Greece in 1979.
In 1987 he published his book for guitar technique, The Virtuose Guitarist.
In 1998 he became an Honorary Citizen of Dallas (Texas).
Since 2008 he is professor also of the University of Indianapolis, Athens Campus .

Since 2009 he is professor of the State Conservatory of Thessaloniki.

He played in concert halls like the Auditorium de Madrid, Grande Auditorium Radio France, Concertgebouw Amsterdam, Concert Hall BBC, Alt Opera Frankfurt, Filarmonie de St. Petersburg, "Tschaikowsky" Moscow, Palais de Beaus Arts Brussels, Palais de Congres de Paris, Athens Concert Hall ("Megaron"), Herodium Theater and many others.

He played as a soloist with the following orchestras: Liege (Belgium), RTBF Brussels (Radio, Belgium), Sofia Soloist (Bulgaria), Orquesta Sinfonica de la Habana (Cuba), Czech Virtuosi (Czech Republic), Cyprus Symphony Orchestra (Cyprus), BBC Concert Orchestra (England), Oxford Pro Musica (England), Auvergne (France), Cannes (France), Nouvelle Filarmonie Paris (France), Athens Camerata (Greece), Athens State Symphony (Greece), Patras Soloist (Greece), Radio Orchestra (Greece), Volos Symphony (Greece), Thessaloniki State Symphony (Greece), Orchestra of Colours (Greece), Bochum (Germany), Frankfurt Oder (Germany), Radio Symphony Frankfurt (Germany), Junge Deutsche Philharmonic (Germany), Bari (Italy), Beer Sheva (Israel), Pomeriggi Musicali di Milano (Italy), Lithuanian Symphony Orchestra (Lithuania), Baja California (Mexico), Katowice AUKSO (Poland), Katowice Symphony (Poland), Wrochlaw (Poland), Oporto (Portugal), San Juan (Puerto Rico), Brasov (Rumania), Moscow Symphony (Russia), Ankara Bilkent University Orchestra (Turkey) Istanbul Philharmony (Turkey), Cermal Resit Rey Istanbul (Turkey), Bursa Symphony (Turkey), Ankara Hacetteppe (Turkey), Ankara Presidential (Turkey), Akbank Orchestra (Turkey), Radio-TV Belgrade (Serbia), Skrovan Soloist Belgrade (Serbia), Cordoba Symphony Orchestra (Spain), Las Palmas Canarias (Spain), Orquesta de la Reina Sofia de Madrid (Spain), Donetsk (Ukraine), Rostov (Ukraine) and others.

He collaborated in concerts with artists like Astor Piazzolla, Mikis Theodorakis, Theodore Antoniou, Maria Farandouri, Angelica Cathariou, Leo Brouwer, John Williams, John McLaughlin, Al di Meola, Stanley Jordan, Vicente Amigo, José Antonio Rodriguez, Juan José Mosalini, Odon Alonso, Saulis Sondechkis, Simeon Kogan, Jean Jacques Kantorow, Peter Soave, Hector Ulisses Passarella, Isel Rodriguez Trujillo, Patrice Fantanarosa, Milva, Roberto Limón and many others.

Composers like Theodore Antoniou, Sergio Assad, Dusan Bogdanovic, Leo Brouwer, Ernesto Cordero, Anton Garcia Abril, Vojislav Ivanovic, Rafael Fays, Thanos Mikroutsikos, Alberto Nunez Palacios, Yalcin Tura dedicated works to him.

He was invited to music festivals like Athens (Greece), International Classical Music Festival of Cyclades (Greece), Reingau (Germany), Bremen (Germany), Granada (Spain), Palma de Mallorca (Spain), Sevilla (Spain), Bemus (Serbia), Istanbul (Turkey) and many others. Besides he played many premiéres of composers like Mikis Theodorakis, Theodore Antoniou, Thanos Mikroutsikos, Sergio Assad, Leo Brouwer, Ernesto Cordero, etc.

He was invited to guitar festivals like Forum Wien (Austria), Festival de Liege (Belgium), Havana (Cuba), Brno (Czech Republic), Mikulov (Czech Republic), Kutna Hora (Czech Repulic), Radio France (France), Festival de Guitare de Paris (France), West Dean College (England), Martinique (France), Mettmann (Germany), Koblenz (Germany), Gevelsberg (Germany), N??rtingen (Germany), Iserlohn (Germany), Wilhelmshaven (Germany), Leverkusen(Germany), Velbert (Germany), Remscheidt (Germany), Esztergom (Hungary), Alessandria (Italy), Mauro Giuliani (Italy), Tel Aviv (Israel), Ligita (Lichtenstein), Tijuana (Mexico), Queretaro (Mexico), Saltillo (Mexico), Culiacan (Mexico), Herceg Novi (Montenegro), Amsterdam (Netherlands), Lima (Peru), San Juan (Puerto Rico), Tychy (Poland), Wrochlaw (Poland), Krakow (Poland), Sinaia (Rumania), Belgrade (Serbia), Cordoba (Spain), Lugo (Spain), Las Palmas (Spain), Tenerife (Spain), Palamás (Spain), Andrés Segovia, Madrid (Spain), Andrés Segovia, Linares (Spain),Guerrero (Madrid, Spain), Bratislava (Slovakia), Thailand Guitar Festival (Thailand), Alirio Diaz (Venezuela), GFA (USA) and many others.

He gave masterclasses at academies and universities like Mozarteum, Salzburg (Austria), Laval University Québec (Canada), Copenhagen (Denmark), ??rchus (Denmark), Köln (Germany), Wuppertal (Germany), Weimar (Germany), Berlin (Germany), Düsseldorf (Germany), Stuttgart (Germany), Oslo (Norway), Katowice (Poland), Gnessin Moscow (Russia), Inönü (Turkey), Manhattan School of Music N.Y. (USA), Denton Univesity Dallas (USA), Auberlin Ohio (USA), Memphis (USA) and many others.