Duncan Aldred has been appointed acting Opel/Vauxhall vice president, sales, marketing and aftersales after Alfred Rieck, a member of the Opel management board, resigned from his position.
Aldred (43), who is chairman and managing director of Vauxhall Motors, will combine his new role with his current responsibilities.
"We respect Alfred Rieck's decision and wish him the best in his future endeavors," said Opel supervisory board chairman Steve Girsky.
"Day in and day out, Duncan Aldred delivers clear proof that our business plan works and our attractive models are the key to success."
Appointed managing director in January 2010, Aldred has been successfully building the Vauxhall brand.