This is a crucial area. If you do not have schema markup and rel="author", you are costing your business money. It is as simple as that. As an example, say I want to make spaghetti (pasta) for dinner I search for “Spaghetti Recipe” and instantly I see some great markup in play, but one competitor has no markup and no rel="author" they are losing business in my eyes. Wouldn't you agree?.
Remember when you used to rely solely on search engines for traffic? Remember when you worked on SEO and lived and died by your placement in Google? Were you #1? Assured success. Well, okay, maybe not assured. Success only came if the keywords were relevant to your site users, but it was the only real roadmap to generating site traffic and revenue.