He studied at the Sibelius-Academy in Helsinki and continued his studies at the Udo Reinemann’s International Lied Masterclass at the Consevatory of Amsterdam as well as Alberto Zedda’s Accademia Rossiniana in Pesaro.

Tuomas Katajala made his stage debut in 2006 at the Savonlinna Opera Festival as Tamino in Die Zauberflöte which followed immediately house debut in Finnish National Opera as Count Libenskof in Il viaggio a Reims. 

Katajala has been a member of the ensemble of Finnish National Opera from 2009 until the end of the season 2013/14. He has sang also at the Royal Opera House Covent Garden, Teatro Nacional de São Carlos Lisbon, at the Komische Oper Berlin, Berlin Staatsoper and Staatsoper Hamburg, Oslo Opera House, Netherlands Reisopera, Opéra National du Rhin in Strasbourg, Opéra de Lille, Grand Théâtre Luxembourg, Seattle Opera, The Israeli Opera in Tel Aviv, Savonlinna Opera Festival.

Tuomas Katajala makes also remerkable career as a concert and oratorio singer. He has appeared in concert programs at the Accademia Nazionale di Santa Cecilia in Roma with Orchestra dell’Accademia Nazionale di Santa Cecilia, Leieiszhalle Hamburg with Symphoniker Hamburg, at the Oslo Concert Hall with Oslo Philharmonic Orchestra, at Helsinki Music Centre with Finnish Radio Symphony Orchestra, at National Music Auditorium Madrid with Spanish National Orchestra. Performed at several music festivals like La Folle Journee au Japan festival in Tokyo, Annecy Classic Festival and D’Auvers sur Oise festival in France, Kuhmo Chamber Music festival and also at the Royal Albert Hall in London, Salle Pleyel in Paris and Avery Fisher Hall in New York.

He has worked with Kent Nagano, Matthias Pintscher, Enrique Mazzola, Andrew Lawrence-King, Peter Schreier, Esa-Pekka Salonen, Sakari Oramo, Mikko Franck, Vladimir Ashkenazy, Sir. David Wilcocks, Roy Goodman, Carsten Schmidt, Sebastien Rouland, Christopher Warren-Green, John Storgåds, Antonino Fogliani, Leif Segerstam, Michael Güttler, Hannu Lintu, Pietro Rizzo and Howard Arman.

In 2021 he made his Bolshoi Theatre debut, performing Don Ottavio in the opening night of Don Giovanni.