Adam Noah & Isaac all authored the book of Genesis

Unlike the rest of the Torah Moses only edited Genesis from ten firsthand witnesses



TOLEDOTH THEORY

In recent years a much better insight into the origin of Genesis has emerged. As ancient Near Eastern libraries have been unearthed and their contents deciphered many insights into biblical times have been gained. In particular, tablets from before the time of Moses in the area of Mesopotamia (where Abraham hailed from) were noted to frequently contain a colophon – a formula of sorts, at the close of the tablet. This is similar to modern customs of ending a letter with a formula like "Sincerely yours, (Name)".

Often these tablets were family records or king-lists giving the ancestry of a person. The Hebrew term for generations is toledoth. These tablets would contain a colophon describing who had written the tablet or whose history it recorded. Scholars recognized that these colophons were similar in structure to toledoth phrases in Genesis:

1) "These are the generations of the heavens and of the earth when they were created." (Genesis 2:4a)

2) "This is the book of the generations of Adam." (Genesis 5:1)

3) "These are the generations of Noah." (Genesis 6:9)

4) "Now these are the generations of the sons of Noah, Shem, Ham, and Japheth." (Genesis 10:1a)

5) "These are the generations of Shem." (Genesis 11:10a)

6) "Now these are the generations of Terah." (Genesis 11:27a)

7) "And these are the generations of Isaac, Abraham's son." (Genesis 25:19a)

8) "This is the account of Abraham's son Ishmael." (Genesis 25:12a, see below)

9) "This is the account of Esau (that is, Edom)." (Genesis 36:1, see below)

10) "These are the generations of Jacob." (Genesis 37:2)

The implication of these colophons in Genesis is that they separate Genesis into distinct source documents each dating from the period of the person named in them. These source documents were handed down from father to son until the time of Moses, when they were edited together to form the book of Genesis under divine inspiration. In almost every case the logical author for each document would be the person named in the colophon itself. The statements immediately following each colophon would be the beginning of the next tablet; for example, Genesis 2:4b reads "When the LORD God made the earth and the heavens…" beginning Adam’s story.
[link to www.rae.org]