Germain Gabriel Grisez (September 30, 1929 – February 1, 2018) was a French-American philosopher.
[1] Grisez's development of ideas from Thomas Aquinas has redirected Catholic thought and changed the way it has engaged with secular moral philosophy.
2' (1965), Grisez attacked the neo-scholastic interpretation of Aquinas as holding that moral norms are derived from methodologically antecedent knowledge of human nature.
Grisez defended the idea of metaphysical free choice and proposed a natural law theory of practical reasoning and moral judgment which, although broadly Thomistic, departs from Aquinas on significant points.
[2] Grisez was Professor of Christian Ethics at Mount St. Mary's University in Emmitsburg, MD[3] from 1979 to his retirement in 2009.