Anupam Garg is a professor in the department of Physics & Astronomy at Northwestern University, Illinois. He received his Ph.D. in 1983 from Cornell University. In 2012 he became a Fellow of the American Physical Society (APS) thanks to his work on molecular magnetism and macroscopic quantum phenomena. Garg is best known for formulating the Leggett–Garg inequality, named for Anthony James Leggett and himself, which is a mathematical inequality fulfilled by all macrorealistic physical theories. He is also known for the Garg-Onuchic-Ambegaokar model of charge transfer. His current research interests center around quantum and semi-classical phenomena associated with the orientation of quantum mechanical spin. Garg is the author of a graduate physics textbook, Classical Electromagnetism in a Nutshell.