door2door's allygator shuttle addresses the so-called "last mile" issue (Photo: door2door)

Karl-Thomas Neumann, former CEO of Opel, is investing in mobility start-up door2door. Neumann will also join the board of the directors of the German ride sharing-technology specialist.

Neumann headed Opel from 2014 until 2017, when General Motors sold the carmaker to France's PSA Group. Following the announcement of the sale, Neumann initially stayed with the company, but left a few months later.

He earlier served as a senior executive of Volkswagen Group and as CEO of supplier Continental.

“door2door is a groundbreaking company aimed at achieving the kind of disruptive innovation that’s driving the mobility industry forward,” Neumann said in a press release. He added that the company is well positioned to "unlock new possibililties for a real mobility revolution."

On its web site, door2door says one of its goals is to make public transport as comfortable as the private car. For that purpose, the start-up has built a software platform that allows city governments and public transport operators optimize existing mobility services and personalize them when needed.

door2door recently announced a public transportation partnership with the western German city of Duisburg. The cooperation provides an on-demand ride-sharing service that is fully integrated into the city's publication network.

The company has also launched a free on-demand shuttle service in Berlin. The service, which is called allygator shuttle, addresses the so-called "last mile" issue of getting people from a public transport stop to their front door.