Klaus Häger was born in Wuppertal, where he also received his training in cello, piano and organ. While still at school he worked as an organist and choir and orchestra director. After graduating from high school, he first studied school music and later studied singing with professors Dr. Franz Müller-Heuser, Ingeborg Most and Jürgen Glauß (song composition) at the Cologne and Freiburg conservatories. This was followed by master classes with Sena Junnac, Ernst Haefliger and Dietrich Fischer-Dieskau. While still studying, he fulfilled obligations for song recitals, orchestral concerts and numerous oratorio performances at home and abroad. Almost all German broadcasters signed him up; Numerous records and CD recordings as well as TV recordings complete the singer's artistic activities. Klaus Häger was a winner of numerous international competitions such as the International Mirjam Helin Singing Competition Helsinki 1989 or the International Mozart Competition of the cities of Venice, Prague and Vienna. He won the Oberdörffer Prize in Hamburg in 1992 and the Federal Singing Competition in Berlin in 1990 (1st prize in the concert subject and two special prizes). He was also a scholarship holder from Federal President Richard von Weizsäcker and the Walter Kaminsky Memorial Foundation. From 1991 to 1997 Klaus Häger was a member of the ensemble of the Hamburg State Opera, and from 1997 to 2003 he was a member of the ensemble of the Berlin State Opera. In 2002 he made his debut at the Bayreuth Festival in "Die Meistersinger von Nürnberg" under Christian Thieleman; He also appeared at the Salzburg Festival. Guest appearances have taken him to the opera houses of Berlin (Deutsche and Komischer Oper), Munich, Dresden, Cologne, Bonn, Madrid, Milan and Tokyo, among others. In concert, he regularly performs in the major music centers of Germany, Europe and Asia, as well as at Carnegie Hall in New York. Collaboration with conductors such as Daniel Barenboim, Christian Thielemann, Zubin Mehta, Riccardo Chailly, René Jacobs and Helmuth Rilling shaped his artistic career. In particular, the great works of Johann Sebastian Bach and the operas of Wolfgang Amadeus Mozart were always at the center of his artistic work. Klaus Häger passes on his knowledge and skills to future generations in master classes at home and abroad and, since 2004, as part of his professorship at the Rostock University of Music and Theater. Since the winter semester of 2022/23 he has also held a visiting professorship at the “Hanns Eisler” University of Music in Berlin.