July 2009- 2013: Associate invistigator at NIH
July 2007 -2009 : Fellow at Cardiovascular imaging Program at National Heart, Lung, Blood Institute.
July 2005 -2007 :
at National Heart, Lung, Blood Institute.
February 2001- June 2005:
at Cairo University Hospitals-Cairo University-Egypt.
February 1998 - February 2001:
at Cairo University Hospitals –Cairo University-Egypt.
March 1997 - May 1998
at Cairo University Hospitals, Egypt; includes Departments of: Cardiology, Internal Medicine, Pediatrics, Surgery, Ob-Gyn, & Anesthesia.
February 1997:
at Mayo Clinic, Rochester, Minnesota USA