Stephen Mills

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+1 212 209 7486 direct
New York

Previous Experience

  • Vice President and Senior Internal Audit Executive, American Express Co.
  • Vice President, Enterprise Risk Services, American Express Co.
  • Vice President and Audit Leader, Japan/Asia/Australia, American Express International

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Stephen Mills

Managing Director

Stephen advises clients on internal audit and internal control frameworks; risk management; corporate governance; regulatory relationships; compliance transformation initiatives; quality assurance and compliance testing; Bank Secrecy Act, anti-money-laundering, and sanctions compliance; mortgage servicing and loss-mitigation practices; model validation; and other areas of regulatory compliance. He also helps clients with the implementation of a control and compliance culture. 


Prior to joining Promontory in 2009, Stephen spent nearly 20 years in global positions with American Express, where he was a senior member of the global internal audit team. He was general auditor of the company’s major U.S. and international bank subsidiaries and was responsible for global internal-audit regulatory relationships. Also while at American Express, he was responsible for the development and implementation of a number of leading practices in internal audit and risk management, including risk-assessment methodologies, facilitated risk workshops, audit-universe development, control self-assessment activities, development and implementation of operational-risk frameworks, and Sarbanes-Oxley Act compliance. Stephen has extensive global experience, having lived and worked in Asia and Europe, as well as the U.S.


  • B.A., finance and accountancy, University of Brighton

Affiliations, Awards, and Civic Engagements

  • Chartered accountant, Institute of Chartered Accountants in England and Wales
  • Certified internal auditor, Institute of Internal Auditors
  • Certification in control self-assessment, Institute of Internal Auditors

Representative Engagements

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