With two colleagues, as the firm Heinz & Mathoi & Streli, he built private homes in the alpine landscape of Tyrol, schools, offices and public buildings, among others.

[2] Friedrich Achleitner commented about their projects that they influenced the new specific architecture considerably ("... einen großen Einfluss auf die öffentliche Wahrnehmung der neuen Tiroler Architektur genommen").

[4] The joint extension of the University Hospital in Innsbruck, created by adding a technical and a clinical floor for gynecology and neurology on top, built from 2006 to 2008, was nominated for the award of the Fundació Mies van der Rohe in 2009.

[5] In 2008, Springer published a monograph of their works, both group and individual projects, titled Heinz-Mathoi-Streli / Architekten / Bauten und Projekte / Buildings and Projects, with evaluations by Achleitner and Otto Kapfinger [de].

[1] Works by Heinz were part of the exhibition Autochtone Architektur in Tirol presenting the architecture of Tyrol with respect for the alpine landscape, in Munich in 1994.