My research interest is in the area of theoretical chemistry. I focus on systems that undergo non-adiabatic dynamics upon electronic excitation. I have developed novel theoretical approaches to investigate various research problems which spanned from electronic states dynamics to polaritonic states dynamics. Examples of my research projects include, the photoisomerization of the retinal chromophore in Rhodopsin, Singlet fission in organic materials, and light induced-conical intersection created by the quantized radiation field in the framework of cavity quantum electrodynamics. An important aspect of my research is to connect with optical experiments, such as pump-probe and two-dimensional electronic spectra and to provide a quantitative and a comprehensive interpretation for the experimental results.