Kristen Knutson is an associate professor of neurology, working at the Northwestern University Feinberg School of Medicine.[1] [2] With researchers from the University of Surrey, she studied the mortality rate of half a million people over 6.5 years and concluded that people who self identify as "definite evening type" had a 10 percent higher mortality rate than those who identified as "definite morning type".[3] It was the first study of its type to look into the mortality rate of night owls.