Rev. R.J. Rushdoony (1916–2001), was a leading theologian, church/state expert, and author of numerous works on the application of Biblical law to society. He started the Chalcedon Foundation in 1965.  His Institutes of Biblical Law (1973) began the contemporary theonomy movement which posits the validity of Biblical law as God’s standard of obedience for all. He is credited with igniting the modern Christian school and homeschooling movements in the mid to late 20th century. Many ministry and educational efforts that continue today, took their philosophical and Biblical roots from his lectures and books.