We are seeking an experienced and highly skilled Chief of Staff to work closely with an American UHNWI with diverse business interests. The ideal candidate will possess 15-20 years of experience, exceptional numerical acumen, and the ability to operate at Board level on behalf of the Principal. Responsibilities include serving as a strategic advisor and proxy in high-level meetings, overseeing multiple business interests, providing comprehensive financial support, and leading special projects. The role requires excellent organisational, leadership, and communication skills, with flexibility for regular travel. This position offers a competitive salary, benefits package, and opportunities for professional growth. This role will suit a highly experienced and motivated Chief of Staff looking for a challenging and rewarding role.