Following talks with club chairman Martin Kind on Wednesday morning, an agreement was reached to terminate Schmadtke's contract, which was due to run until 30 June 2013.
"Huge role in development"
Schmadtke joined the 96ers as sporting director in the summer of 2009 and was made executive director of sport in 2011. "It was a very intensive and emotional time," said the 49-year-old. "I'd like to thank the club's hierarchy, my colleagues and the fans for all their support."
Kind voiced his regret at Schmadtke's departure: "Jörg Schmadtke expressed his desire to swiftly end our working relationship and Hannover 96 agreed to his wish. He has been very successful with the club over many years and made good and important decisions. He has played a huge role in Hannover's positive development and we're very grateful for that."