My primary research area is making direct observations of the early universe. Most recently I have focused on building and using low frequency radio interferometers that observe the 21 cm line at redshifts z>6, during the Epoch of Reionization (EoR) -the Cosmic Dawn- when the first stars, galaxies and black holes formed and ionized the intergalactic medium. Reionization is the last global phase transition and marks the transition from a cosmological universe, dominated by dark matter to the age of Baryons.

Here are a few popular-press articles and books, sadly some paywalled, consult your local library: