The term 'THE GIVING TREE AUTHOR SILVERSTEIN' is a crossword solution that refers to the American poet, singer-songwriter, and author Shel Silverstein. He is best known for his children's books, such as The Giving Tree, which was published in 1964. Silverstein also wrote plays, including the Broadway hit musical, A Boy Named Sue. He was also a cartoonist and songwriter, having written songs for Johnny Cash, among others. His works have been translated into more than 30 languages and have sold over 20 million copies. The other crossword solution, IBSEN, refers to the Norwegian playwright Henrik Ibsen, who is considered one of the founders of modernism in theatre. He wrote a number of influential plays, including A Doll's House, Hedda Gabler, and The Wild Duck.