developed a fast Gaussian process technique based on the Rybicki Press algorithm which has been used to model stellar variability in data from the NASA TESS spacecraft. Most recently he led a team which used transit-timing with the Spitzer Space Telescope to precisely characterize the Terrestrial Planets in the Trappist-1 system, showing that they share a common composition that differs from the terrestrial planets of the Solar System Personal life Agol is the identical twin brother of mathematician Ian Agol. References American astrophysicists 21st-century American astronomers 1970 births Living people University of Washington faculty UC Berkeley College of Letters and Science alumni University of California, Santa Barbara alumni American identical twins