What's the meaning of "about"?

“All over the world people are taking notes as a way of postponing, putting off and standing in for,” Mr Dyer writes, including supposedly ***about*** himself.

Question

What's the meaning of "about"?

“All over the world people are taking notes as a way of postponing, putting off and standing in for,” Mr Dyer writes, including supposedly ***about*** himself.

Answer

In that example "about" serves as a preposition.  It refers to the 'subject of' or to information "about" himself (Mr. Dyer).