Ken Osawa studied horn and vocal music at Nihon University College of Arts. He then completed his studies at the Niki-Kai Opera Studio receiving an award for excellency; his successful performance in Sarastro's "The Magic Flute" in the occasion of the completion of his course at Niki-kai won him high praise for his deep and powerful voice and his strong stage presence.
In 1993, after receiving excellent reviews for his role as a soloist in Louis Hector Berlioz's "The Damnation of Faust" conducted by of Seiji Ozawa, Ken Osawa moved to Germany. He signed an exclusive contract as principal bass soloist with the Theatre Osnabruck (originally City theatre) in Lower Saxony (Germany). He has performed in numerous cities in Germany in roles of Phillip II of Spain in "Don Carlo"; the King in "Lohengrin"; Crespel in "The Tales of Hoffmann"; Don Basilio in "The Barber of Seville"; the Hermit in "Der Freischutz"; the King in "The Love of Three Oranges", receiving excellent reviews from newspapers and specialized publications which described his voice as "refined and deeply reverberating"and praised his acting skills as "with realism".
In the fall of 1997, Ken Osawa transferred his base to Japan, where he has hitherto performed in numerous operas at the New National Theatre; Niki-Kai; with the Tokyo Philharmonic Opera Concertante ; Kanagawa Arts Foundation; Osaka Festival Hall; Biwako Hall; Mozart Theatre. His singing and acting, full of composure and dignity, has been highly recognized. He has also performed with principal orchestras in Japan with Beethoven's "Symphony No.9", active in singing oratorios and lieder, and has collaborated with the German Bach Soloists conducted by Helmut Winschermann. He is highly acclaimed for his wide range of repertoire starting from Bach to contemporary music . He is a member of the Niki-kai.