Associate ProfessorNational Centre for Radio Astrophysics,Tata Institute of Fundamental Research, PuneIndiaEmail : tirth@ncra.tifr.res.inI have been involved in theoretical modeling of the process of reionization and comparing these models with different observations. I am also interested in developing numerical simulations to generate realistic maps of HI 21cm emission arising from the hyperfine transition of neutral hydrogen, that might be observed with current and upcoming radio telescopes such as the GMRT, the Low-Frequency Array (LOFAR) and the Square Kilometer Array (SKA).