I am an astronomer working on observational methods and data analysis in Time Domain Astronomy. I also have close ties to NASA's Transiting Exoplanet Survey Satellite (TESS).

My research investigates the structure of extragalactic objects using timing experiments. My main expertise is in Supermassive Black Holes and Supernovae.

For Supermassive Black Holes, I study the immediate environments around the black holes and the physics of accretion. I am an expert on the Reverberation Mapping technique, which uses light echoes to probe the matter distributions close to the black holes. I am also leading several observing campaigns to investigate the connection between X-ray and ultraviolet/optical emission in actively accreting black holes. 

For Supernovae, I use time domain observations to investigate the nature of the exploding star and the physics of the explosion. I have used TESS light curves to produce one of the strongest limits to date on the nature of Type Ia supernova progenitor star systems.

Recently, I have expanded my research program to include multimessenger astronomy, hunting for optical counterparts of exotic short-duration transients, gravitational wave sources, and high energy neutrino sources. In the longer term, I am preparing for wide-field, multiwavelength monitoring facilities that will be available in the next 2 to 10 years, with a special emphasis on large data sets (Rubin Observatory LSST,  Roman Space Telescope) and multiwavelength data sets.

Lastly, I lead the TESS Data Analysis Working Group (DAWG). The DAWG is responsible for approving the TESS data products for public release, including transiting planet candidates.

Please contact me by email if you would like to learn more about my research.