Provides high-level administrative, project coordination, communication, and organizational support to the COO and executive leadership team. Responsibilities include managing calendars and meetings, preparing materials and reports, tracking projects and action items, coordinating cross-department initiatives, supporting board and committee activities, assisting with member communications and events, and handling confidential information. The role requires strong judgment, organization, writing, follow-through, and the ability to manage shifting priorities in a private-club environment.