He was a member of the technical staff from 1984 until 1989 at
AT&T Bell Labs at Murray Hill, where his research interests were focused on mobile robots. In 1989 he joined
NEC Research Institute in Princeton, New Jersey, as a senior research scientist in the computer science division. At NEC, his research shifted to problems in computer vision and he was responsible for creating the computer vision group at NECI. He has worked on problems to do with stereo and motion correspondence and multimedia issues of image database retrieval and watermarking. In 1999, he was awarded the
IEEE Signal Processing Society Best Paper Award (Image and Multidimensional Signal Processing Area) for a paper he co-authored on watermarking. From 1997 to 1999, he served as Chief Technical Officer of Signafy, Inc., a subsidiary of NEC responsible for the commercialization of watermarking. Between 1996 and 1999, he led the design of NEC's watermarking proposal for DVD video disks and later collaborated with IBM in developing the technology behind the joint Galaxy proposal supported by Hitachi, IBM, NEC, Pioneer and Sony. In 1999, he returned to NEC Research Institute as a Research Fellow. ==Awards and honors==