Mary Warnock (1924 - 2019) was an English moral philosopher and Mistress of Girton College, Cambridge from 1984 until 1991. She was made a life peer in 1985 and given the title Baroness Warnock of Weeke in the City of Winchester. She was the author of numerous books, including Ethics Since 1900 (1960), The Philosophy of Jean-Paul Sartre (1963), Existentialist Ethics (1966), Existentialism (1970), An Intelligent Person's Guide to Ethics (2000), Dishonest to God: On Keeping Religion Out of Politics (2010), and Critical Reflections on Ownership (2015). She is widely regarded as a trailblazer for establishing ethical frameworks around deeply controversial issues such as special needs education and human fertility treatments, and is credited with laying the blueprint for regulatory policymaking in these areas.