Thomas Hill Green (7 April 1836 – 26 March 1882), known as T. H. Green, was an English philosopher, political radical and temperance reformer, and a member of the British idealism movement. Like all the British idealists, Green was influenced by the metaphysical historicism of G. W. F. Hegel. He was one of the thinkers behind the philosophy of social liberalism.
Negative liberty, or negative freedom, is freedom from interference by other people. Negative liberty is primarily concerned with freedom from external restraint and contrasts with positive liberty (the possession of the power and resources to fulfill one's own potential). The distinction originated with Bentham, was popularized by T. H. Green and Guido De Ruggiero, and is now best known through Isaiah Berlin's 1958 lecture "Two Concepts of Liberty".