The APSG International Symposium on the "Cross-Disciplinary Role of Space Geodesy in Natural Hazards Mitigation, Geodynamics and Climate Change Science" will be held on 14-17 October, 2013, on the campus of Ohio State University, Columbus, Ohio, USA. The First Circular of the APSG Symposium has been released. Warmly welcome you to participate in the APSG Symposium. Please fill in the Pre-Registration Form which is attached in the First Circular and send it to Mr. Peter H. Luk by Email (apsg2013@earthsciences.osu.edu) or Fax: +1-614-292-7688 as soon as possible if you plan to participate in it. Additional detail about the Symposium, will be forth coming in the near future on the Symposium website (http://apsg2013.geodeticscience.osu.edu). Looking forward to seeing you in Columbus, Ohio, USA in October, 2013.