The nature of providing health care services is changing, particularly as the focus shifts from hospital-based care to providing care in more cost-effective settings. The introduction of the Affordable Care Act and other key drivers are making it increasing important for health care providers, and their supply companies, to reduce costs for customers and patients, says Greg Halvacs, the Chief Security Officer and Senior Vice President for Global Security, Flight Operations and Global Real Estate at Cardinal Health, a health care services company based in Dublin, Ohio.

This year’s Most Influential is organized by five categories: Corporate Security Practitioners, Public Sector Security, University/Think Tanks, Cybersecurity and State/Local Government Security.

The Security 500 has also partnered with ASIS by inviting their CSO Roundtable members.

Frederick Chang recently joined Southern Methodist University to develop a multidisciplinary program to tackle the most pressing cyber challenges facing the world today.

Each year, Security magazine honors top security executives who positively impact the security industry, their organization, their colleagues and their peers.

UK-based security conference IFSEC International has announced their top 40 people in the security and fire industries today.