His earliest research was with Prof. Marc Davis and Douglas Finkbeiner working on dust maps of the universe.
These maps proved to be essential for removing foregrounds in subsequent imaging or cosmic microwave background surveys.
From 2008 to 2014 he was the principal investigator (PI) for the Baryon Oscillation Spectroscopic Survey (BOSS) project[4] on the Sloan Telescope, at Apache Point, NM.
[5] This project was part of the Sloan Digital Sky Survey and created a three-dimensional map of 1.5 million galaxies.
DESI will construct a three-dimensional map of tens of millions of galaxies spanning the local universe to 11 billion light years.