noun
Refers to a person who writes a specific piece, such as an article, book, or report. Often used in formal or professional contexts.
この本の執筆者は有名な学者です。
The author of this book is a famous scholar.
雑誌の執筆者を募集しています。
We are looking for contributors to the magazine.
筆者 is a humble or formal way to refer to oneself as the writer of a text, whereas 執筆者 is a neutral term for any writer.
Compound of 執筆 (writing) and 者 (person). The exact historical derivation is uncertain, but the components clearly indicate 'one who writes'.