During the early phase of his career (1983-1991), Dumarey acquired New Impriver, a Ghent-based[1] company specializing in metal name-tags and aluminum anodization.

[9] These facilities have been building the Holden Commodore and its derivatives, which are based on the GM Zeta platform and, in V6 configuration, have been using six-speed automatic transmissions produced by Punch Powerglide.

As part of his "Project Erich", Dumarey intends continuing to manufacture these large rear-wheel drive cars, as premium local and export products.

[10] A pivotal moment occurred in 2020 when Dumarey Group acquired the GM Propulsion Engineering Centre in Turin, Italy, with some 750 employees.

The European Investment Bank approved 40 million euros in funding in 2023[15] to support automotive engines powered by hydrogen, with research conducted in Turin and Strasbourg.

In June 2023, Dumarey Group announced the acquisition of the Italian subsidiary of Vitesco Technologies (300 million turnover, 800 employees) [17][18] for 1st January 2024 with the goal of a higher vertical integration for its future hydrogen engines.

This acquisition led to the formation of Dumarey Green Power, merging flywheel and battery storage technologies to create a unique energy management offering.