>> when i did some volunteer work at the university of the west indies.ecause i always wanted to be a teacher, and then as i'm doing the volunteer work, i was so intrigued with the doctors going on rounds, being with patients. that you see patients come in very sick and then they leave very well and then i said, "oh this is so exciting" and i never looked back. >> reporter: this is kind of fun! how did you pick a specialty? >> that's the thing. in the third year of medical school you do what is called your clinical rotation and that is you do a little internal medicine, some obstetrics and gynecology, pediatric, general surgery, psychiatry and as you go along you form your impressions. is this what i really love? "and you will find that specialty that says "wow" -- where you can't wait to come back the next morning where you can't sleep, you don't want to miss anything! >> reporter: where you don't mind going to bed at 1:00 and waking up at 5:30? >> now you're talking! that's it. once you're sterile, you keep your hands up and then you walk in. >> reporte