Neil Strauss is the first well-known author to post on Steemit, but he won't be the last. My choice for next to join Steemit is Neal Stephenson.
Neal is one of the greatest sci-fi authors of all-time, with books like Snow Crash, Cryptonomicon, and the Diamond Age. He's been writing about cryptocurrencies, AI and VR for 20 years and Steemit is right up his alley.