Once again, we look forward to hosting another Berkeley Symposium on Energy Efficient Electronic Systems, a forum that we founded in 2009. Biennially, we bring together researchers who are working on breakthrough improvements in energy efficiency for information processing systems. Our goal is that the Symposium continue to be a venue for the attendees to gain an integrated perspective of the challenges and advances in this domain of technology through sessions that cover the entire food chain, from devices to systems. As in the two previous symposia, we expect that the academic setting of UC Berkeley will encourage open exchanges of ideas, and foster closer cooperation and collaborations among the researchers. For the first time, we welcome IEEE Electronic Devices Society as a technical co-sponsor. Also new, the 2013 Organizing Committee is issuing a Call for Papers. These changes are intended to broaden participation at the Symposium, thereby furthering the Symposium's goal of fostering information exchanges and collaborations.