• Research/Clinical Fellow in Oncology, The Johns Hopkins University, School of Medicine, Baltimore, MD, USA (1988-1990)
• Senior Clinical Fellow in Oncology, The Johns Hopkins Hospital, Baltimore, MD, USA (1988-1990)
• Instructor in Oncology, The Johns Hopkins University, School of Medicine, Baltimore, MD, USA (1990-91)
• Assistant Professor of Oncology, The Johns Hopkins University, School of Medicine, Baltimore, MD, USA (1991-1996)
• Associate Professor of Oncology, The Johns Hopkins University, School of Medicine, Baltimore, MD, USA (1996-1998)

1977-83

• Bachelor of Medicine
• Bachelor of Surgery 
• Bachelor of Obstetrics
• Trinity College Dublin, The University of Dublin, Ireland
• Diploma, American Board of Internal Medicine (1990)
• Diploma, ABIM, Medical Oncology (1993)

• Membership of the Royal College of Physicians of Ireland (1985)
• Fellowship of the Royal College of Physicians of Ireland (1998)