Carol McD. Wallace is an American author known for writing both fiction and non-fiction. She has written books on a range of topics, including history, lifestyle, and etiquette. Among her works is the popular "To Marry an English Lord," co-authored with Gail MacColl, which explores the phenomenon of American heiresses marrying into the British aristocracy during the late 19th century—a book noted for its influence on the television series “Downton Abbey.” Wallace's body of work reveals a knack for engaging storytelling and thorough research, making her a versatile and respected writer in her various areas of expertise.