prefacer
This term is relatively rare and often functions as a functional noun derived from the act of prefacing. When referring to a person, it describes a specific role in publishing, though the term "introducer" or "foreword writer" is more common in professional contexts.
In a conversational context, the word describes the introductory remarks that set the stage for a main point. It often carries a slightly critical or impatient connotation, suggesting that the introductory material is an obstacle or a delay before the primary subject is addressed.
Meanings
A person who writes a preface to a book or other literary work.
The author thanked the prefacer for providing such a thoughtful introduction to the volume.
A statement or remark made as an introduction to a speech or a conversation.
His long prefacer about the weather delayed the start of the actual presentation.