George Economou has turned up the heat in his war of words with the board and management of New York-listed tanker owner Performance Shipping.

The Greek shipowner is launching a proxy fight, tapping his own nominee to the Performance board and seeking resignations from four existing directors, including chief executive Andreas Michalopoulos.

Economou also wants a look at “certain books and records” of the Nasdaq-listed company pursuant to laws of the Marshall Islands, where Performance is domiciled.