From Wikipedia: Danny Sullivan is an American technologist, journalist, and entrepreneur. He was the Chief Content Officer at Third Door Media, and co-founded Search Engine Land, an industry publication that covers news and information about search engines, and search marketing, SEO and SEM topics. Third Door Media also produces Marketing Land, a sister website that covers broader digital marketing topics including social media, display advertising, email marketing, analytics, mobile, and marketing technology. Search Engine Land and Marketing Land are owned by Third Door Media, of which Danny Sullivan was partner and chief content officer. He retired from his position as Chief Content Officer at Third Door Media in June 2017.
In October 2017, Sullivan announced he will be joining Google as an adviser at the search division of the company. Danny is Google’s public Search Liaison, who helps people better understand search and helps Google better hear public feedback.