Ue-Li Pen Research Int erests Science: --Cosmology & Large Scale Structure: Cosmic Reio nization, Dark Energy/Matter dynamics (lensing, BAO). --MHD physics: Non-radiative Accretion flows, MR I Tools: --21cm data: GMRT, Cylinders --large scale simulations: CITA clusters, SciNet --weak lensing data: CFHLS, IRAC Main Collaborators: -- Jeff Peterson (CMU), Y. Gupta, R. Nitayananda (NCRA), C. Matzner, B. Pang, J. Harnois-Deraps, T. Lu, T. Chang (Toronto), K. Sigurdson, L. van