2005 - present, Senior Biostatistician/Associate Research Professor, Division of Biostatistics, Department of Computational and Quantitative Medicine, Beckman Research Institute of City of Hope, Duarte, California
2003 - 2004, Visiting Scholar, Pediatric Pharmacology Research Unit, University of California, San Diego
2002 - 2005, Research Scientist, Frontier Science and Technology Research Foundation, Inc., Boston, MA
1995 - 2001, Senior Biostatistician, Frontier Science and Technology Research Foundation, Inc., Boston, MA
1991 - 1994, Biostatistician, Statistical and Data Analysis Center (SDAC), Harvard School of Public Health, Boston, MA
1987 - 1989, Faculty Research Associate, Biometrics Program: Department of Animal Sciences, University of Maryland, College Park, MD
1984 - 1987, Graduate Assistant, Biometrics Program: Department of Animal Sciences, University of Maryland, College Park, MD
1980 - 1984, Graduate Assistant, Department of Physical Education, University of Maryland, College Park, MD