Patti Davis is an American author and actress, born on October 21, 1952. She is the daughter of former U.S. President Ronald Reagan and Nancy Reagan. Davis has written several books, including novels and memoirs, often exploring themes of family and personal identity. In addition to her writing career, Davis has appeared in various television shows and films. She is also known for her advocacy work, particularly in areas related to mental health and Alzheimer's disease, influenced by her father's battle with Alzheimer's during his later years.