Who is Mr Cunningham in To Kill a Mockingbird?

Mr. Cunningham was one of the men from Old Sarum who came to lynch Tom Robinson but was unsuccessful because of Scout, Jem, and Dill's interruption. He was also one of Atticus' clients when he needed legal help with a land problem. Scout and Jem had taken his son, Walter, home from school to have lunch with them on their first day of school. When Scout recognized him and began to talk to him on a personal level, he was convinced to lead the Old Sarum mob back home without hurting anyone.