Experimental High Energy Particle Physics and Astrophysics. Detector and Accelerator Development. Current Interest: Proton-Proton Collider CMS Experiment at CERN, Switzerland since 2004. Atmospheric Neutrino Oscillation Experiment INO in Theni near Madurai in Tamil Nadu, India since 2004. Neutrino Experiments/Projects at Fermilab LBNF-DUNE since 2010, NO?_?_A since 2012. Neutrino, Dark Matter Phenomenology and their connections - In?_?_isibles ?????? 2012 -2016.