The USPS announcement for this stamp reads: “The extraordinarily versatile Shel Silverstein (1930–1999) was one of the 20th century‘s most imaginative authors and illustrators. His picture book “The Giving Tree” and his quirky poetry collections are beloved by children everywhere. The stamp art features a version of the illustration of a boy catching an apple that appears on the cover of “The Giving Tree.” Published in 1964, the best-selling tale of selflessness is considered a children’s literature classic. Art director Derry Noyes designed the stamp.”
But there was much more to Silverstein’s versatility. From Wikipidia, just a few of many works: “his cartoons appeared in issues of Playboy from 1957 through the mid-1970s; Uncle Shelby’s ABZ Book (1961), his first book [was] of new, original material for adults; Silverstein also wrote Cash’s biggest hit, ‘A Boy Named Sue’ [and] lyrics and music for most of the Dr. Hook & the Medicine Show songs on their first few albums; Silverstein had a popular following on Dr. Demento’s radio show; wrote more than 100 one-act plays.”