I am a seismologist to determine the seismic structure of the Earth's interior for understanding its chemical composition and dynamic processes by analyzing seismic phases. Particularly, I am interested in constraining the seismic anisotropy, the directional and polarizational dependence of seismic wave speeds, which is a consequence of strain-induced lattice-preferred orientation of mineral in the Earth's mantle. Measurement of seismic anisotropy represents perhaps the best tool available to directly probe the past and present patterns of deformation at depth. To get better understanding of the Earth interal structure and dynamics, I also incorporate seismic results with constraints from other Earth science fields, like geodynamics and mineral physics.