A bald man wearing glasses, a light blue shirt, a dark blue blazer, and a patterned pocket square, smiling against a plain white background.

I'm Lindsay O'Sullivan, founder of Tenet Advisory. My work is grounded in 25 years leading organisations through growth, transition and transformation within complex, highly regulated environments.

I've held C-suite and non-executive roles in these settings, working with boards, regulators, funders and governments on issues that call for clarity, collaboration and strong judgement.

My experience spans strategy execution, growth, organisational culture and performance, governance, technology adoption, financial management, risk management, stakeholder management, capability uplift, customer experience, innovation and digital transformation.

I'm known for building trust quickly, creating alignment across leadership teams, simplifying complex environments, and helping people act with confidence.

Tenet Advisory is built on three principles: pragmatism, generosity, decisiveness, and rigour. Read more about what that means in practice.