City Paper Editor Chris Potter will be leaving the alternative weekly newspaper to join the staff of the Pittsburgh Post-Gazette. Potter confirmed via Twitter that he would be leaving the City Paper, where he has worked for 17 years. He didn't immediately respond to an email seeking comment. "I can't express the gratitude I feel to my CP colleagues for my time with them," Potter wrote via Twitter. Potter has been editor of City Paper since fall 2004, when he succeeded Andy Newman.