George Berkeley was born to an English noble family at Dysart Castle, near Thomastown, Co. Kilkenny on March 12, 1685. He attended Trinity College Dublin. He was recognized for his contributions to philosophy and theology, as well as his studies on physics, mathematics, relativity and optics. He is the father of the concept of immaterialism, the philosophical realm of thinking which denies physical the existence of material objects. He contended that material objects existed only in the mind of the perceiver. He was appointed Bishop of Cloyne in Ireland. He died on this day in 1753.