His first engagement in Germany was at the "Kammeroper" in Neuss, where he performed in J. Offenbachs Opera "Bata Clan" and "Pomme D'Api". At the Stadtheater (city theatre) of Koblenz productions like "Freischütz", "Die Verkaufte Braut", "Viva La Mama" and "Die lustige Witwe" followed. 1994 Harrie worked in four productions at the Wagner festivals in Bayreuth. His first musical characters were "Gus/Growltiger" and "Old Deuteronemy" in Hamburg's "Cats". In the production of Joseph in Essen Harrie played the premiere cast of "Jakob", "Potiphar" and the "Guru".

  Afterwards he appeared in Stuttgart as "Maurice von Unruh" and "D'Arque" in the production of "Disney's Beauty and the Beast" on stage. Since 1995 Harrie organises more and more often organisations like benefits-performances and musical concerts like "Musical Stars for Aid(s)", "Broadway and Beyond" in Hamburg as well as "Musical Magic" in Stuttgart. From 1992 on Harrie Poels is known as an official singing teacher for many musicals like - Cats, Joseph, Beauty and the Beast, and Miss Saigon. Since January 2000 he is at the musical in Bremen where he also has his own singing school and gives private lessons.

  Harrie is one at the ensemble swing performing the characters of Utterson, Proops, Lord Glossop, Sir Danvers, Lord Savage, Bischof von Basingstoke, Poole and Albert. A many talented person who is now a the weekends at Jekyll & Hyde and during the week working in Berlin in "Glöckner von Notre Dame" (Hunchback of Notre Dame).