We are pleased to inform you that the International Symposium on “Frontier of Gamma-ray Spectroscopy (gamma11)” is scheduled to take place at RIKEN Wako campus in Saitama (Japan) on June 30 - July 2, 2011. This symposium is co-hosted by the Center for Nuclear Study of the University of Tokyo (CNS) and the RIKEN Nishina Center. This is the fourth meeting in a series of CNS-RIKEN Joint symposium on frontier of gamma-ray spectroscopy following the last meeting held in 2008 (gamma08). The purpose of the symposium is to discuss recent progress and future perspectives of gamma-ray spectroscopy and recent development of advanced gamma-ray detectors. It is hoped that the symposium will encourage international cooperation and stimulate physicists in the field of nuclear structure studies. Future collaboration for the experimental programs at RIBF will be discussed. The symposium will start in the morning of June 30 and end in the afternoon of July 2. It will be held in the Conference Room of RIBF Building in RIKEN.