100 Executive Women in Tech
to Watch in 2025
Barbara O'Neill
Global Chief Information Security Officer at EY
Barbara is EY Global Chief Information Security Officer and provides strategic direction for all matters relating to information security.
She joined EY in 1997 as the Director of Information Security for Ernst & Young LLP in the US, assuming responsibility for the Americas Region in 1999. Barbara then accepted the EY Global Chief Information Security Officer role in 2002.
Prior to joining EY, she was the Vice President of Information Technology for a human resource and benefits solutions provider.
Seasoned in information security management, IT strategy, governance and audit, Barbara also held various IT positions with a leading telecommunications company.
She earned her BS in Computer Science from Saint Peter’s University and her MS in Computer Science from Fairleigh Dickinson University.
She joined EY in 1997 as the Director of Information Security for Ernst & Young LLP in the US, assuming responsibility for the Americas Region in 1999. Barbara then accepted the EY Global Chief Information Security Officer role in 2002.
Prior to joining EY, she was the Vice President of Information Technology for a human resource and benefits solutions provider.
Seasoned in information security management, IT strategy, governance and audit, Barbara also held various IT positions with a leading telecommunications company.
She earned her BS in Computer Science from Saint Peter’s University and her MS in Computer Science from Fairleigh Dickinson University.
