What you consider to be the differences between an author and authoring? Similarities?

answers1: "An author" is a person or institution. "Authoring" is the
process of writing. This seems pretty obvious and not really worth
discussing at much length. <br>
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Maybe you should re-think your question.
answers2: An author is a person who writes books or articles, usually
for money. It can also refer to the person responsible for something,
like the author of a plan to overthrow the student government. <br>
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Author comes from the Latin word auctorem, meaning "founder, master,
leader." Bow down to the author! Well, no need for that, just make
sure the author gets credit. Author usually refers to a professional
writer. In fact, author can be used interchangeably with the word
writer. But author packs a little more punch — an author is involved
in the creation of the work and generating the ideas behind it.
Strictly speaking, a writer could just execute the written product.
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Authoring is the process of creating documents and programs on a
computer using special software. <br>
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<a href="http://www.macmillandictionary.com/dictionary/american/authoring"
rel="nofollow"class=Clr-b>http://www.macmillandictionary.com/dicti...</a>
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<a href="http://www.collinsdictionary.com/dictionary/english/authoring"
rel="nofollow"class=Clr-b>http://www.collinsdictionary.com/diction...</a>
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<a href="http://dictionary.cambridge.org/dictionary/british/authoring"
rel="nofollow"class=Clr-b>http://dictionary.cambridge.org/dictiona...</a>
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The present participle of author is used only in computer applications. <br>
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# Authoring systems, computer based systems that allow the creation of
content for intelligent tutoring systems <br>
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# Optical disc authoring and DVD authoring, the process of creating a
DVD or a CD from multimedia source materials. <br>
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http://en.wiktionary.org/wiki/authoring?rdfrom=Authoring <br>
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Writing, as by an author has become obsolete.