Re: Resume Experience
Dear lord. It's people like that who keep me employed.
I'm authering a prezentashun rite now.
More on topic, the person intended to use the word "author," which is usually a noun, as a verb meaning "to write."
She authored three books on the subject means she wrote three books on the subject. In this case the person wrote letters to customers.
I generally favor simplicity and see no reason to use the word "author" when the perfectly acceptable word "write" is available.
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.