Waber debuted as an author in 1962 with "The House on East 88th Street," which introduced readers to the loveable Lyle, first spotted in a bathtub in an Upper East Side brownstone. Lyle's story continued in "Lyle Finds His Mother," "Lyle and the Birthday Party" and other works. Waber also wrote many non-Lyle books, such as "Ira Sleeps Over," in which a boy fears he'll be teased for bringing a favorite stuffed teddy bear to a friend's house.
Waber was a native of Philadelphia and a graduate of what was then known as the Philadelphia College of Art.
He is survived by his brother, three children and four grandchildren. His final book, "Lyle Walks the Dog," was a 2010 collaboration with his daughter, Paulis.