In 1998 Heinz acquired a repetiteur/conductor position at the State Theatre of Mecklenburg, Germany, where he directed several musicals and The Barber of Seville. In Berlin, Heinz directed new productions for the Neukoellneroper; these productions comprise Shakespeare’s Midsummer Night’s Dream, Wild’s The Young Prince and Le Vin Herbe, by the Swiss modernist, Martin. These productions were widely reviewed in the German press, as was his unique arrangement of Kurt Weill’s One Touch of Venus which premiered with Germany’s favourite pop star, Marianne Rosenberg. He also conducted an A Grade performance of Joseph and the Technicolour Dreamcoat in Essen.
In 2005 and 2006, on returning to Australia, Heinz presented Sid the Serpent and Hansel and Gretel for OzOpera in NSW and Cinderella and The Sound Garden in 2009 and 2010. Heinz has also produced, written and performed in two cabaret performances at the Seymour centre: Kathleen Ferrier: A Time of Kings and Queens, and Noel and Cole: Lives in Exile. In addition to his duties as Musical Director for Pacific Opera in 2007, Heinz presented The Curious Pain of Louis XIV, which was performed at the Seymour Centre. He wrote the book, lyrics and music for this piece. Heinz wrote the music for the musical A Nasty Piece of Work (book and lyrics by Nicholas Parsons), which was commissioned by the New Theatre and premiered in 2008. In 2009, he was commissioned to write a children’s musical Wombat’s Wild Weekend which toured in pre-schools throughout Sydney. In 2010 he produced 40 In Song, a retrospective of his best 18 songs. He has written incidental music for many productions including Hell Hath No Fury, Suddenly Someday, The Crucible, Mrs Petrov’s Shoe, Burnt By The Sun, and The Farnsworth Invention.