Introduction : critical infrastructure and risk analysis -- Early history -- Current critical infrastructure protection -- The Department of Homeland Security -- Other federal risk management agencies -- Public-private partnerships -- Laws and regulations -- The DHS perspective on risk -- Methods of risk assessment -- Sector-specific agencies approaches to risk : food and agriculture sector, water and wastewater sector, energy sector -- Sector-specific agencies' approaches to risk : healthcare and public health sector, transportation systems sector and emergency services sector -- Sector-specific agencies' approaches to risk : communications sector, information technology sector, and financial sector -- The future of critical infrastructure protection : risk, resilience, and policy