NewsOther Borussia Dortmund sign Hertha Berlin midfielder 19/05/2010 FacebookTwitterWhatsApp The 24-year-old joins the club on a free transfer and has signed a contract that will keep him at the club until the summer of 2013. Piszczek joined Hertha Berlin from Gwarek Zabrze in the summer of 2004 and became a key player at the club.