Someone who cuts down trees is commonly referred to as a “tree cutter” or a “tree feller.” They may also be called a “tree removal specialist” or simply a “logger” if they are involved in the logging industry, which focuses on the harvesting of trees for various purposes such as timber production. In a more formal context, they might be referred to as an “arborist” or a “tree surgeon” if their work involves the careful removal of specific trees for safety, health, or aesthetic reasons.