LISA is a space-borne gravitational wave (GW)observatory under development by the European Space Agency (ESA). It aims at the GW spectrum between a few tens of micro-Hz and a fraction of a Hz, which cannot be accessed by ground-based detectors. Such frequency range gives access to million solar mass sources at cosmological distances, and non-transient GW astronomy of our Galaxy. A precursor mission, LISA Pathfinder, that has preceded LISA, successfully showed the necessary space-time metrology. the talk will review the science and achievements of LISA Pathfinder, the status of LISA, and some recent highlights on LISA science.