Main actor of a cross-border insolvency is the liquidator, who has authoritative powers concerning the assets of the bankrupt?s estate, the creditors and the debtors. Because of the fact, that ?the Regulation? has not only autonomous regulation rules on content, but often refers to the national provisions of the member states, the author elaborated particularly the Austrian and German insolvency law. The amendments in the Austrian insolvency law which occurred by the Bankruptcy Amendment Act 2010 (IRÄG 2010), which came into force on 7.1.2010, are included.In the first main part of this master thesis, the author examines the powers of the ?main liquidator? in an opened insolvency proceeding. Nature and extent of the powers arising from the law of the opening State (lex fori concursus). However, the radius of the main liquidator is limited by numerous exceptions. From the opening of secondary insolvency proceedings on, the ?main liquidator? has no more direct access concerning the assets of the debtor situated within the territory of this secondary insolvency State. However, the ?main liquidator? has indirect control and intervention options in terms of opening, process and termination of secondary insolvency proceedings, despite the legal independence of primary and secondary insolvency procedures. In this context, the author analyzes the major powers of the ?main liquidator?: the autonomous right to request the opening of secondary insolvency proceedings, the duty to cooperation and communicate information, the exercise of creditors' rights, the stay of liquidation and the procedural measures terminating secondary insolvency proceedings.Many particular powers of the international insolvency liquidator are based on different provisions of ?the Regulation?. However, important areas of its core radius remain unregulated in whole or in part, or are controversial.