Andrew Sharmat, previously collaborated with his mother, Marjorie Weinman Sharmat, the creator of Nate the Great. Now Andrew continues solving mysteries with Nate and Sludge. Nate the Great and the Earth Day Robot is his first solo Nate the Great mystery. n nOlga and Aleksey Ivanov are renowned childrens book illustrators/authors and classically trained commercial artists. This talented husband-and-wife team immigrated to the United States in 2002 and found their home #hylandstudio in the Rocky Mountains, Colorado. nIn all, the two have illustrated over 100 childrens books around the globe. Visit them online at www.ivanovillustration.com. nn