He was a long-term member of the Staatsoper Dresden and the Komische Oper Berlin, often with director Harry Kupfer at both houses.
[2] He sang leading roles in the world premieres of Udo Zimmermann's Der Schuhu und die fliegende Prinzessin on 30 December 1976 and Kunad's Vincent on 22 February 1979 in Dresden.
[2] Haseleu appeared as Holofernes in the world premiere of Judith by Siegfried Matthus on 28 September 1985 at Berlin State Opera.
[1] Haseleu died in Leipzig in June 2012 at the age of 77 years and was buried at the Heidefriedhof [de] in Dresden.
[2][3] Haseleu's voice is preserved on recordings of Die schweigsame Frau by Richard Strauss, Moses und Aron, Udo Zimmermann's Levins Mühle [de], scenes from Lear and Judith, and Der Rosenkavalier.