In February 1987, he came to the Cerro Tololo Inter-American Observatory and within a few days of his arrival when the Type II supernova SN1987A exploded in the Large Magellanic Cloud, he began a major campaign at CTIO to monitor this important supernova.
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She attended Bates College, where she graduated with a Bachelor of Science degree in 2000 with a double major in Math and Physics and participated during the summer in programs at the Harvard–Smithsonian Center for Astrophysics, Kitt Peak National Observatory in Arizona, the Cerro Tololo Inter-American Observatory in Chile, at the Arecibo Observatory in Puerto Rico and at the Los Alamos National Laboratory in New Mexico.
He is the past director of Cerro Tololo Inter-American Observatory of the National Optical Astronomy Observatory and is the Associate Director and Carnegie Staff Member at Las Campanas Observatory in Chile, part of the Observatories of the Carnegie Institution for Science.
He was a professor at Rutgers University and later a project scientist for the U.S. office of the Gemini Observatory Project at the Cerro Tololo Inter-American Observatory (CTIO) in Chile.