Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The economy of Pittsburgh, Pennsylvania is diversified, focused on services, medicine, higher education, tourism, banking, corporate headquarters and high technology. Once the center of the American steel industry, and still known as "The Steel City," today the city of Pittsburgh has no steel mills. Pittsburgh was recently chosen for the 2009 G-20 summit as its transformation is an example of a twenty first century economy. On September 8, 2009 President Barack Obama stated, "Pittsburgh stands as a bold example of how to create new jobs and industries while transitioning to a 21st century economy."