James Orlin Grabbe (/ˈɡreɪbiː/; October 8, 1947 – March 15, 2008) more commonly referred to as J. Orlin Grabbe, or just JOG, was an American economist and prolific writer with contributions in the theory and practice of finance. He was known by his book International Financial Markets, and for mathematical models for options and derivatives used in international finance and foreign exchange.