As an Executive Assistant supporting the leadership function at Sierra, you will provide a wide range of strategic and administrative support to our executive leadership team. You will proactively manage several leaders' calendar, travel, and meetings, ensuring that meetings are effective by sending preparation materials, following up on action items, and serving as a knowledgeable resource on relevant topics or organizational matters. You will draft team and external correspondence on behalf of the leader, liaise with internal staff and external stakeholders, and maintain a high level of confidentiality and discretion with all materials and information. Additionally, you will plan and execute internal events (in-person and virtual), including team offsites, trainings, and team travel, while establishing and improving administrative systems and processes as part of Sierra's founding admin team.