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.”

Silverstein is a member of the HarperCollins family of writers, and you might heed the author's words if you want to leave your mark on the notable publishing house—perhaps as its new director of marketing.

Tasked with channeling traditional and nontraditional media to elevate the presence of HarperCollins' imprint William Morrow among authors, agents, and readers, the director of marketing position requires more than someone who merely thinks they can get the job done.

You better take a closer look at the details here before you apply. Wouldn’t want you to come crashing back down a hill, now would we?