Three generations hold distinct responsibilities within a shared duty: to preserve family capability, exercise sound judgement in the present and prepare deliberately for those who follow.
Leonard represents continuity, family responsibility and service across generations. His life has included Royal Air Force service, firefighting and technical work associated with naval detection systems. As the family’s senior steward, he provides historical perspective, preserves family memory and embodies the principle that authority is held on behalf of those who follow.
Steven formalised the Office in 2026 and leads its strategy, governance, family interests and institutional relationships. His wider record spans sovereign-scale programme delivery, military command, corporate recovery, audit chairmanship and board leadership. Within the Office, his responsibility is to convert family purpose into disciplined governance, proportionate institutional structure and long-horizon stewardship.
Roger Stefan Windmill is Director of Investment & Stewardship and Principal-Designate of the Windmill Family Office. He is responsible for developing the Office’s administrative and documentary architecture, maintaining oversight of family and investment records, supporting portfolio operations, and preparing for the orderly transfer of knowledge, responsibility and assets across generations.
Heritage, present authority and planned succession.
The three-generation structure is not presented as ceremony. It records distinct responsibilities within one institutional continuum: Leonard safeguards memory and continuity; Steven exercises present authority and develops the Office; Roger builds the judgement and capability required for future stewardship.
The Office is intended to remain coherent as individual custodians change.