Marketing Director of marketing at HarperCollins An opportunity of a lifetime at the publisher that brought you works from Mark Twain and Maurice Sendak. By Alan PearcyJuly 23, 2012 SHARE Ragan Insider Premium Content If the track is tough and the hill is rough, THINKING you can just ain’t enough! That is the closing line of Shel Silverstein‘s “The Little Blue Engine,” a poem included in the late author’s acclaimed book “Where the Sidewalk Ends.” To read the full story, log in. Become a Ragan Insider member to read this article and all other archived content. Sign up today Already a member? Log in here. Learn more about Ragan Insider.