Final answer:
A Historical Preservationist is the person committed to preserving, conserving, and protecting buildings and landscapes of historical importance, not to be confused with a landscape designer who focuses on designing and planning outdoor spaces.
Step-by-step explanation:
A person who seeks to preserve, conserve, and protect buildings and landscapes of historical importance is best described as a Historical Preservationist. Historical preservationists are deeply involved in the efforts to maintain and restore sites of historical significance. This includes not only architectural structures but also culturally important landscapes. They work closely with various legislation like the National Historic Preservation Act (NHPA) to ensure the integrity and protection of historical locations.
Landscape designers also work with natural and created environments but their role typically focuses on designing aesthetically pleasing and functional spaces, which might include rehabilitating areas that have been impacted by human intervention. However, the responsibility for protecting and conserving historical sites primarily falls under the purview of a historical preservationist, not a landscape designer.