Moving forward, the 4th XWS will focus on the Multiscale Imaging in Biology. Confocal microscopy, single molecule spectroscopy, cryoelectron microscopy/tomography are now major platforms in life sciences research. We are grateful that Prof. Wah Chiu of Baylor Medical College and Prof Paul Matsudaira of the National University of Singapore will chair the scientific program committee and we look forward to another high quality meeting in Dec 8 th to 10th, 2013.