[Calvin Locke]

I think it's "Those than can, do. Those that can't, teach. Those that can't teach, write. Those that can't write, write for [insert local publication]".

I'd add, "Those that can't write for the [local rag], edit the opinion page".

[aruanan]

I think it's "Those than can, do. Those that can't, teach. Those that can't teach, write.

No, it's "Those than can, do. Those that can't, teach. Those that can't teach, administrate or counsel."