Senior Executive Assistant & Office Manager

Join ACIThe Alliance for Critical Infrastructure (ACI) is seeking a highly organized and proactive Senior Executive Assistant & Office Manager to support senior executives and manage the day-to-day operations of our Washington, DC office. Combining senior-level executive support with hands-on office management, this role will coordinate complex calendars, travel, meeting preparation, and follow-up while keeping office logistics, vendors, and administrative routines running smoothly. Working closely with leadership and external stakeholders, you will help manage competing priorities, handle sensitive information with discretion, and ensure executives are prepared and commitments stay on track. This opportunity is ideal for a resourceful professional who anticipates needs, takes ownership, and enjoys building practical processes that help a growing, mission-driven organization operate effectively.What You'll Do·  Manage complex calendars, meetings, travel, expenses, and executive priorities for senior executives·  Prepare agendas, briefing materials, presentations, correspondence, and follow-up actions·  Coordinate Board, member, government, partner, and leadership meetings and events·  Oversee office operations, vendors, supplies, facilities, visitors, and workplace logistics·  Support employee onboarding, administrative records, and special projects·  Build efficient administrative practices and office routines as ACI growsWhat You'll Bring·  8+ years of executive assistant, senior administrative support, or office management experience·  Experience supporting multiple senior executives and managing competing priorities·  Exceptional organization, communication, judgment, discretion, and follow-through·  Strong proficiency with Microsoft 365, including Outlook, Teams, Word, Excel, PowerPoint, and SharePoint·  A proactive, solutions-oriented approach and comfort working in a fast-paced, mission-driven environmentWhy ACIYou will work closely with senior leaders and external stakeholders while helping build a growing organization focused on strengthening America's critical infrastructure. The role offers broad exposure, meaningful responsibility, and the opportunity to shape how ACI's executive and office operations function.Position Details·  Location: Washington, DC·  Employment Type: Full time - Hourly·  Reports to: Chief Executive OfficerInterested candidates should submit a resume and brief statement of interest.