Rushworth Kidder, founder of the Institute for Global Ethics in Rockport, died Monday at the age of 67.

The institute said Kidder died of natural causes in Naples, Fla., where he moved late last year. No other details about his death were immediately available Tuesday, but the institute said it plans to release more information today.

Before founding the Institute for Global Ethics in Camden in 1990, Kidder was a senior columnist and features editor for The Christian Science Monitor.

During his tenure at the paper, he produced a series of interviews with leading thinkers that evolved into an ethics beat.

His most recent book, “Good Kids, Tough Choices: How Parents Can Help Their Children Do the Right Thing,” was published in 2010.

Kidder, who kept a home in Lincolnville, also wrote “Moral Courage” and “How Good People Make Tough Choices: Resolving the Dilemmas of Ethical Living.”

He was born in Amherst, Mass., and earned a doctorate from Columbia University in English and comparative literature.

He is survived by his wife, Anne Elizabeth Davidson Kidder, and two daughters.