Chergui, Majed2019-11-052019-11-052019-04-1610.1039/C9FD00036Dhttps://infoscience.epfl.ch/handle/20.500.14299/162695WOS:a000477683900001After presenting the basic theoretical models of excitation energy transfer and charge transfer, I describe some of the novel experimental methods used to probe them. Finally, I discuss recent results concerning ultrafast energy and charge transfer in biological systems, in chemical systems and in photovoltaics based on sensitized transition metal oxides.text::journal::journal article::review article