Hermann Henkel and Rüdiger Thoma assume direction and liability as general partners of the management, Hans-Joachim Stutz
and Michael Zotter are partners. Helmut Hentrich and Hubert Petschnigg belong to the advisory board of the company.

HPP Laage & Parner Planungsgesellschaft mbH, which specializes in the construction of hospitals, is founded.

Helmut Hentrich and Hubert Petschnigg transfer their advisory capacities to Hans Joachim Stutz and Michael Zotter. Hubert Petschnigg and Rüdiger Thoma die. Joachim H. Faust along with Hermann Henkel becomes a general partner of the firm´s management. HPP Service GmbH is founded.

Prof. Dr.-Ing. Helmut Hentrich dies at the age of 95.

Gerhard G. Feldmeyer becomes a general partner and assumes direction of HPP KG together with Hermann Henkel and Joachim H. Faust.

Hermann Henkel joins the advisory board oh the company.

The partnership becomes a GmbH + Co. KG (limited liability company and limited commercial partnership) with managing partners Joachim H. Faust and Gerhard G. Feldmeyer and partners Gerd Heise, Remigiusz Otrzonsek, Werner Suebai and Volker Weuthen.
The firm´s headquarter are moved to the Dusseldorf Media Harbor.

Helmut Hentrich opens an architecture office.

Helmut Hentrich and Hans Heuser found the architecture firm.

With the early death of Hans Heuser, the consortium is continued under the leadership of Helmut Hentrich and Hubert Petschnigg.

By taking on of new partners, the firm is now called HPP Hentrich-Petschnigg & Partner.

HPP Bau- und Projektmanagement GmbH is founded.

The partnership is transformed into a limited commercial partnership.

The direction and liability of the firm is transferred to Hans Joachim Stutz and Rüdiger Thoma. Helmut Hentrich and Hubert Petschnigg continue their work at HPP as part of the firm´s management.

HPP International Planungsgesellschaft mbH, which is devoted to increasing the firm´s foreign activities, is founded.