Simon Le Clerc
Independent judgement shaped by experience
Northridge Strategic Advisory Ltd is an independent, principal-led advisory practice founded by Dr Simon Le Clerc MStJ.
Simon brings Board, executive, operational and advisory experience spanning defence, healthcare, international commercial organisations, the public and charitable sectors, and professional sport. His career has involved consequential decisions in complex, regulated and safety-critical environments, where evidence may be incomplete, time constrained and the human or organisational consequences significant.
His perspective combines independent Board judgement with practical experience of leadership, governance, assurance, organisational resilience and operational reality.
Every Northridge engagement is led personally by Simon.
Experience across different worlds
Simon’s career has crossed environments that are rarely considered together: defence and operational medicine; healthcare and pre-hospital emergency care; international commercial leadership; charity governance; and the wellbeing and support of people in professional sport.
Across these different settings, the underlying challenge has often been the same: how do those carrying responsibility know whether the picture presented to them reflects organisational and operational reality?
This breadth allows Simon to recognise patterns that can remain hidden when an issue is viewed through a single-sector or single-profession lens. It also brings a practical understanding of how governance, leadership, culture and human consequences interact when important judgements must be made.
Judgement grounded in operational reality
Independent support calibrated to the significance of the judgement—not the size of the organisation or seniority of the role.
Simon has worked where governance oversight, executive responsibility, operational leadership and frontline delivery meet. This has included leading organisations and services, contributing to governance and assurance arrangements, advising senior decision-makers and working within environments where the consequences of weak understanding can be significant.
That experience has reinforced a consistent lesson: formal governance structures are essential, but their existence does not by itself establish that an organisation is understood, that assurance is reliable or that intended processes are working in practice.
Simon’s approach connects strategic intent and formal reporting with the realities experienced by those implementing decisions. The work is calibrated to where the need arises—from Board and executive questions within large international organisations to consequential judgements exercised by founders, professionals, operational leaders, and middle and senior managers in public and charitable organisations. He brings independent challenge while remaining attentive to context, proportionality and the responsibilities held by the client.
The thinking behind the work
When do you know you know enough?
Simon has written The Assurance Gap: When Do You Know You Know Enough?, which examines how leaders determine whether they have sufficient understanding to exercise consequential judgement when certainty is unavailable.
The question is relevant wherever responsibility is carried—from Boards, investors and executive teams to founders, professionals, operational leaders, managers and those preparing to assume greater responsibility.
The central concern is not whether every risk can be predicted or every uncertainty removed. It is whether the confidence to act is justified by the quality of the available understanding—and whether that understanding is proportionate to the significance, consequences and reversibility of the judgement being made.
The research underpinning the book is supported by the Governance Assurance Evidence Repository (GAER), a structured evidence base approaching 150 documented cases and comparative studies. It draws on organisational failures, successes and adaptive responses across different countries, sectors and organisational levels, including evidence from official inquiries, investigations and regulatory reviews.
From reported assurance to justified confidence
Governance Assurance
Governance Assurance is the evidence-led discipline emerging from Simon’s research into consequential judgement and the Assurance Gap.
It does not replace governance, risk, audit, compliance or other established assurance functions. It examines a different question: whether the information and assurance they produce enable the person carrying responsibility to understand enough—and with sufficient confidence—to exercise a particular judgement.
It helps those carrying responsibility examine whether the confidence with which they are preparing to act is supported by the quality of their understanding, and whether that understanding is proportionate to the significance, consequences and reversibility of the judgement.
Rather than accepting assurance at face value, Governance Assurance encourages different questions:
• What judgement must actually be made?
• What must be understood before it can be exercised responsibly?
• What evidence supports the current understanding?
• Which assumptions, dependencies and uncertainties remain?
• Is the resulting confidence justified and proportionate?
Although relevant to Boards and formal governance, the discipline applies wherever consequential judgement is exercised: across organisations, professional roles and levels of responsibility.
Continue the conversation
If the questions explored here reflect a judgement, assurance concern or organisational challenge you are facing, the next step is a confidential conversation.
Northridge engagements are shaped around the level at which the need arises and the significance of the responsibility involved.