1. Mount Sinai School of Medicine; International Postdoctoral Research Fellow (Award no. IF 05 TW 1075) in Hematology at The Mount Sinai Hospital. Permanent address: Director of Hematology and Radioisotopes, South Africans Institute for Medical Research, Hospital Street, Johannesburg, South Africa.
2. Mount Sinai School of Medicine, Assistant Director of Hematology, Department of Hematology, The Mount Sinai Hospital.
3. Mount Sinai School of Medicine; Associate Director of Hematology, Department of Hematology, The Mount Sinai Hospital; Career Scientist, Health Research Council, City of New York (Award I.435).