- Source of Wealth: Telecom, Self-made
- Age: 61
- Birth Place: Country Cork, Ireland
- Marital Status: Married (Catherine Walsh)
- Nationality: Irish
- Date of Birth: April 19, 1958
- Ethnicity: Irish
- Occupation: Businessman, Telecommunications Magnate
- Education: Boston College, University College Dublin
Denis O’Brien has an estimated net worth of $4.6 billion. All this wealth is believed to have come from his long term commitment in business activities that have made him rich.
Denis O’Brien has a MBA degree in corporate finance from Boston College as well as an honorary doctorate degree from the University College Dublin. He is a renowned philanthropist in the Caribbean region where he gives out part of his earnings to people and he uses the rest in investments.