During 1981-87, he was a research scientist, Leningrad Nuclear Physics Institute, Laboratory of Condensed Matter Physics; in 1987-90 a senior research scientist, Leningrad Nuclear Physics Institute, Laboratory of Condensed Matter Physics; in 1990-92 he was a visiting research associate,
University of Maryland, College Park and special volunteer,
National Institutes of Health, LBM, NIDDK; in 1992-98 he was visiting scientist, National Institutes of Health, LSB, DCRT and LPSB, NICHD; in 1998-02 he was an investigator, head of unit, National Institutes of Health, LPSB, NICHD. He took up his present position in 2002, as section chief in the Laboratory of Physical and Structural Biology, National Institutes of Health,
Bethesda, Maryland. ==Honors==