o Research Associate Professor, Georgetown University, 2009-present o Research Assistant Professor, Georgetown University, 2004-2008 o Research Instructor, Georgetown University, 2001-2004 o Research fellow. Georgetown University, Nephrology and Hypertension 2000-2001 o Research fellow. Copenhagen University Herlev Hospital, Denmark, 1996-2000 o Attending Physician/Lecturer, Sun Yet-Sen University of Medical Science, China, 1991-1995 o Resident Physician, Sun Yet-Sen University of Medical Science, China 1988-1991