Elmo and Mark Rober in a Netflix Christmas special. Courtesy of Netflix Share on Facebook Share on X Google Preferred Share to Flipboard Show additional share options Share on LinkedIn Share on Pinterest Share on Reddit Share on Tumblr Share on Whats App Send an Email Print the Article Post a Comment Logo text With YouTube (73.4 million subscribers) pretty much already in the bag - and its ad share revenue in his bag - former NASA engineer Mark Rober is expanding his presence on that other streaming platform. Rober will host the new student competition series Schooled! on Netflix.