The 2009 TIME 100 Finalists

Cast your votes for the leaders, artists, entrepreneurs and thinkers who deserve a spot on this year's TIME 100. — By Brian Raftery

Nicholas Christakis

nicholas christakis

Paul Schnaittacher

AGE: 47
OCCUPATION: Social scientist
PREVIOUS APPEARANCES ON THE TIME 100: 0

PRO: As the foremost expert in epidemiology — the study of factors that affect human health — Christakis' groundbreaking studies on obesity and smoking have prompted new insights into the role of social networks in our lives.

CON: What's he got against pudgy puffers?

View the full list for "The 2009 TIME 100 Finalists"