Last year Oprah Magazine ran an interview with Harper Lee. It was interesting in all the details she spoke of and she somewhat admitted that Dill was truely based on a childhood friend of heres. Dill was a character who was from Mississippi. He spent his summers in Maycomb. He became friends with Jem and Scout. Because Harper Lee and Truman Capote grew up together and were close friends, many critics seem to think that Dill was patterned after Truman Capote.
Dill is probably a characterization of the author Truman Capote. Harper Lee and Capote were childhood friends and remained friends as adults. Some critics suspect that he did a little more than "help" Harper Lee with the writing of "To Kill a Mockingbird". She, in turn, helped Capote with his most important work, "In Cold Blood." In fact, some parts of that story are obviously based on Harper Lee's notes, which are still in existence.
I assume you mean, "Which author is described in To Kill a Mockingbird as Dill?" In other words, what author is the character of Dill based on.
Given that as the question, the answer is Truman Capote. Truman Capote spent his summers with his aunts, who were neighbors of Harper Lee. Harper Lee based her character, Dill, on the fragile and rather odd (even at that age) Capote.
dills scout's and jem's friend that visits their aunt scout & jems neighbor.
Dill is a friend that spends his summer with his aunt (Scout and Jem's neighbor).