THE GARDENER OF GOVERNANCE
 

The Gardener of Governance – A Call to Action for Effective Internal Auditing, co-authored by Dr. Rainer Lenz and Pro Optima's founder, Barrie Enslin, was published in 2025.
 

The book captures much of the thinking, philosophy and practical experience that have shaped Pro Optima's approach to internal auditing and contributed to its success over almost three decades.
 

It challenges conventional audit thinking and presents practical approaches for making internal audit more relevant, effective and connected to the business.
 

The book carries forewords by two distinguished figures in governance and internal auditing education, Prof. Mervyn King SC, and Prof. Kato Plant, 

The thinkiing behind the book has attracted recognition from leading voices in the profession:

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“This visionary, courageous, and prophetic book merits the attention of the internal auditing community… offering a powerful means of reform for a profession on the threshold of crisis.”

— David J. O’Regan, Auditor General at WHO/PAHO, Washington D.C.