The ultimate goal of my research is the control of the physical properties of matter by unveiling its transient structures and even creating ones of exotic functionality based on the deep understanding of light-matter interactions and structure-function relations. To this end, we develop new imaging tools pushing simultaneous resolutions in space, time, and energy to their limits. We have already installed the third-generation ultrafast electron microscope capable of achieving sub-nanometer and sub-picosecond spatiotemporal resolution, successfully visualizing vibrating nanorods for the first time. As an ongoing effort, we build a correlative ultrafast electron microscope capable of spectroscopy with meV energy resolution towards unraveling carrier-phonon dynamics in a single quantum dot. The areas of research include the study of elementary electronic and structural dynamics in condensed phase, particularly nonequilibrium photoinduced phase transformations, ultrafast electron-phonon interactions in correlated materials, ultrafast chemical/biological dynamics, using both electron- and photon-based ultrafast microscopy (imaging, diffraction, and spectroscopy).