Lincoln Greenhill is a Senior Research Fellow at Harvard University in the Faculty of Arts and Sciences, Department of Astronomy, and he is a Radio Astronomer at the Smithsonian Astrophysical Observatory. His primary research interests at present are the Cosmological Dark Age and Epoch of Reionization, supermassive black holes that lie in the centers of galaxies, signal processing, and massively parallel real-time stream computing with Graphics Processing Units (GPUs).

Greenhill is PI of the Large Aperture Experiment to Detect the Dark Age (LEDA), which seeks to deliver the first observational constraints on the thermal history and evolution of the universe before the first galaxies, when the universe was less than 100 million years old, or < 1% of its present age.  Hosted at Long Wavelength Array installations in New Mexico (LWA1) and at Caltech's Owens Valley Radio Observatory (LWA-OV), LEDA instrumentation merges cutting-edge radio astronomy, real-time supercomputing, and signal processing.  The LEDA correlator is the third largest in the world in computational terms and supplies the signal processing backbone by which the LWA-OV station generates instantaneous snapshot images of the full sky (horizon to horizon) in a search for radio bursts from exoplanets and other phenomena.

Greenhill also leads the Tidbinbilla AGN Maser Survey (TAMS) in collaboration with Ingyin Zaw (NYU-AD) and colleagues at JPL, the NASA Deep Space Network, and Australia's CSIRO.  TAMS has deployed a novel spectrometer to the southern hemisphere's largest radio dish, the 70m antenna at the NASA tracking station near Canberra.  The goal is to survey the sky "down under" in the first unbiased, deep, southern-hemisphere search for emission from water molecules that are in the accretion disks of supermassive black holes in galactic nuclei, at radii that can be as small as 10,000 Astronomical Units (about that of the Solar System as demarcated by the primeval Oort Cloud).