Rettberg trained as a bookseller and started working at Libro Salzburg.
In 1984 the group manager Veit Schalle and founder Karl Wlaschek transferred the reorganization of the then ailing discount chain Libro, a 100% subsidiary of the BML Group ("Billa Group"; today: Rewe International ), to Andrè Rettberg.
After the sale of the “Billa Group” to the German Rewe Group in 1996, initially remaining in Wlaschek's private foundation, Libro went into a management buy-out . At the end of 1997, Libro was sold to a consortium of several financing and investment companies, as well as to individual investors, including Rettberg himself. In November 1999 he listed Libro shares on the Vienna Stock Exchange .  Celebrated as a star renovator in the media, he was named "Manager of the Year" in 1999 by 22 Austrian business journalists for the news magazine News . 
Due to an exaggerated expansion policy, takeover of the Amadeus bookstore chain and founding of the Internet company Lion.cc , towards the end of the 1990s, the company slid into compensation first in 2001 , and bankrupt one year later . Rettberg then fled abroad and went underground for 16 months.
From June 2005, Rettberg stayed in Austria again, as the Ministry of Justice granted him safe conduct until the first judgment was pronounced in the first instance. His defense lawyer was the Austrian Elmar Kresbach . In May 2006 he was sentenced to three years in prison, eight months of which was unconditional, for attempted fraudulent krida . However, this process did not yet refer directly to the Libro bankruptcy, but to the attempted concealment of existing private assets in order to remove them from the access of Libro creditors.  The judgment was initially not final, as Rettberg had filed a nullity complaint because of the possibly incorrectly composed jury senatebrought in. The General Procuratorate and the Supreme Court should examine the case.  The Supreme Court confirmed the guilty verdict. The contested sentence of three years imprisonment, eight months of which was unconditional, imposed by the Vienna Regional Court, was confirmed on September 15, 2008 by the Vienna Higher Regional Court.  The prison sentence should he have to take the beginning of 2009, he was able, however, to the advancement of his family to secure request a one-year reprieve.
In August 2010 it became known that the Westdeutsche Allgemeine Zeitung (WAZ), which held a stake in the Libro subsidiary Lion.cc in 2001, had filed a complaint against Rettberg with the Vienna Public Prosecutor's Office. The point is that the WAZ alleges Rettberg and other suspects to have shifted 350 million schillings (the equivalent of 25.7 million euros) from Lion.cc to mother Libro. The head of the public prosecutor's office confirmed to the free newspaper heute that a case against Rettberg would be initiated based on the WAZ report . At the beginning of 2011, the main proceedings for the Libro bankruptcy 2002 began, in which Rettberg was sentenced on June 21, 2010 to another (not legally binding) prison term of three and a half years. On the other hand, an appeal was made because of the amount of the penalty and an annulment complaint was announced.   .
On June 21, 2011, around a decade after the LIBRO settlement, Andre Maarten Rettberg was sentenced to three and a half years imprisonment as an additional sentence at the regional court in Wiener Neustadt. If the verdict becomes final, he will have to go to prison for a total of four years and two months.
- Andre Rettberg: From "Manager of the Year" to bankrupt. ( Memento from May 25, 2012 in the Internet Archive ) In: Wirtschaftsblatt , October 14, 2009. Retrieved on August 26, 2010
- Libro bankruptcy: From stock market star to bankruptcy. In: News , June 5, 2002. Retrieved August 26, 2010.
- Wirtschaftsblatt, October 14, 2009 (see web links).
- Does the Rettberg trial have to be repeated? In: oesterreich.orf.at. August 3, 2007. Retrieved November 28, 2017 .
- Ex-Libro boss: New report against Andre Rettberg. In: Der Standard / APA , August 17, 2010. August 26, 2010.
- "Libro judgment: 3.5 years additional penalty for Rettberg" In: Tiroler Tageszeitung . Retrieved June 21, 2011.
- "Libro: Rettberg has to go to prison" In: Die Presse . Retrieved June 21, 2011.
|ALTERNATIVNAMEN||Rettberg, André Maarten|
|SHORT DESCRIPTION||Dutch manager|
|DATE OF BIRTH||October 8, 1957|
|PLACE OF BIRTH||Netherlands|