According to the Book of Mormon, Amos was a Nephite record keeper and son of Nephi the Disciple. Amos had custody of the Nephite records for 84 years, from approximately AD 110 to 194. Upon his death the Book of Mormon record passed to his son Amos.
Two verses, 4 Nephi 1:19-20, are an abridgment (by Mormon) of his writings:
19 And it came to pass that Nephi, he that kept this last record, (and he kept it upon the plates of Nephi) died, and his son Amos kept it in his stead; and he kept it upon the plates of Nephi also.
20 And he kept it eighty and four years, and there was still peace in the land, save it were a small part of the people who had revolted from the church and taken upon them the name of Lamanites; therefore there began to be Lamanites again in the land.