Klas mainly worked in the Nordic scene, but might be best remembered for his work leading the now defunct Netherlands Radio Symphony Orchestra. From 1999 to 2001 Klas was music advisor to the Israel Sinfonietta Beersheba, Israel.
Klas was also active as a pedagogue, holding professorships at the Sibelius Academy (1993–97) and the Estonian Academy of Music and Theatre (1997 until his death), where he received an honorary doctorate.
Klas was decorated with the Order of the Lion of Finland (1992, on the occasion of Finland's 75th Independence Day) and the Estonian Order of the White Star. He was a UNICEF Goodwill Ambassador. In 1986, he was named the People's Artist of the USSR. An Estonian lightweight junior boxing champion, he was also a member of the Estonian Olympic Committee.
- Eesti Entsüklopeedia, vol. 14, p. 167. (Tallinn, 2000.)
- "Ulla, Ülle – Eesti Entsüklopeedia". etbl.teatriliit.ee (in Estonian). Retrieved 13 May 2021.
|Wikimedia Commons has media related to Eri Klas.|
- Estonian National Cultural Foundation page on Eri Klas
- Tampere Philharmonic Orchestra page on Eri Klas
- Jewish Community in Estonia, February 2006 bulletin