Journal of Risk and Uncertainty Vol. 26, Issue 2/3, Pages 201-229 2003 HKS Authors See citation below for complete author information. Richard Zeckhauser Frank Plumpton Ramsey Professor of Political Economy Citation Keohane, Nathaniel O., and Richard Zeckhauser. "The Ecology of Terror Defense." Journal of Risk and Uncertainty 26.2/3 (2003): 201-229.