More than 6,700 people have used the site since it was launched in summer 2002.
By Christian Knust, a corporate lawyer for Opel.
The German-language website www.detroitinfo.de gives German expats answers to "all the small and big questions that might arise when moving to Michigan," Knust told Automobilwoche.
The website answers questions such as: Where can I find a good doctor or a skilled manual worker in Detroit? Who do I have to give my social security number to? Which American school is the best for my children?
Knust has publicized his website to the human resources departments of the automobile industry's largest manufacturers and suppliers. Satisfied users have also spread the word around.
The 39-year-old lawyer worked in General Motor's legal department in Detroit from April 2001 until September 2002. He is now based in Opel's headquarters in Ruesselsheim, Germany.
He constantly updates the site with new information he receives through e-mails or entries in the site's guest book.