HumBio area of study: evolution of the nervous system
I was headed for political science until I took Bill Durham's co-evolution course, and changed to HumBio. The wonderful mentorship in the department led me to a Marshall Scholarship, to neuroscience at Cambridge, and then to medical school. As an academic neurosurgeon, I use every ounce of my HumBio education every day, doing science, caring for patients with brain disorders, and teaching the next generation. Creative, team-based, and interdisciplinary approaches are key to everything I do, and I learned them first in HumBio. As a visiting professor to the Stanford Med Center recently, I spent a wonderful afternoon reminiscing with Bill about HumBio in the 1980s! 
Nathan collaborates at work with two other HumBio alumni on a regular basis, and wrote a short article (attached) describing this experience. Read it here.