Social Ecology alumnus Arif Alikhan has been dedicated to protecting people. An expert in counterterrorism and homeland security, he now keeps watch over the world's sixth busiest airport, LAX. "LAX has a very high tempo. We have nine terminals; it's almost like nine airports. We transport 61 million passengers a year and 1.8 million tons of cargo," Alikhan says. "How do you secure an airport with so many people coming and going?"