The Right Word: Roget and His Thesaurus , written by Jen Bryant, illustrated by Melissa Sweet, and published by Eerdmans Books for Young Readers, an imprint of Wm. B. Eerdmans Publishing Co. Peter Mark Roget, whose boyhood passion for list-making and finding the right word for every situation, led him to create his "treasure house" of a book, the thesaurus.