John D. Greenwood was born in Elgin, Scotland, and educated at the Universities of Edinburgh and Oxford. He is currently a professor at the City University of New York Graduate Center, where he specializes in the history of psychology. He is the author of six books and numerous academic papers.
He was a lecturer in the department of philosophy at the National University of Singapore from 1983-1986, when he first fell in love with Singapore, her people and her history. He returned as senior visiting scholar in 1999-2000 and as visiting professor in 2008-2009. He considers NUS to be his second academic home. He also returns regularly to Singapore to visit old friends and old haunts, and considers a trip to Pulau Ubin followed by chilli or pepper crab at in the evening at Changi Village to be a perfect day.
He lives in Richmond, Virginia, USA.