Section Chief, Department of Section of Ophthalmology, Department of Head and Neck Surgery, Division of Surgery, The University of Texas MD Anderson Cancer Center,, Professor, Department of Head and Neck Surgery, Division of Surgery, The University of Texas MD Anderson Cancer Center, Associate Professor, Department of Pediatrics, Section of Hematology-Oncology, Baylor College of Medicine, Associate Professor, Department of Ophthalmology, Baylor College of Medicine- Ophthalmology, Associate Professor, Department of Pediatrics Patient Care, Division of Cancer Medicine, Baylor College of Medicine, Clinical Professor, Department of Ophthalmology and Visual Sciences, The University of Texas Medical Branch at Galveston