An Architectural Historian is a professional who studies the history and development of buildings and structures. They analyze architectural styles, materials, and techniques used throughout different periods and cultures. Their work often involves researching historical documents, conducting field studies, and documenting significant architectural sites. These historians play a crucial role in preserving cultural heritage by assessing the significance of buildings and advocating for their protection. They may work with organizations like the National Trust for Historic Preservation or contribute to projects that aim to restore or maintain historic sites, ensuring that future generations can appreciate architectural history.