 Their research initiated the detailed studies of the sources of gamma-ray bursts along with the European team led by Jan van Paradijs.He was also a member of the Caltech team that observed the first irrefutable brown dwarf in 1994 that orbited around a star called Gliese 229.His recent work involved Palomar Transient Factory which has succeeded in identifying the new groups of optical transients such as superluminous supernova, calcium-rich supernova, and luminous red nova.