. >> reporter: and because they were so poor, young carl quickly set aside his professional aspirationscoming the best auto mechanic he could. >> this is the parts store. >> you'd work on cars in the parking lot of the parts store? >> yeah, sometimes until 1:00, 2:00 in the morning. >> reporter: eventually he got his own shop and for 15 years, he did okay. until one day he decided to ratchet things up. in 2006, carl enrolled at ursulan college. his intention was to get a business degree to help him manage his business shop. but there was one hurdle. a biology class. he couldn't understand why he had to take it and put it off as long as possible. >> i'm a business major. what do i even care about biology? but i went to class, and in the first hour of being there i knew what i wanted to do with the rest of my life. all those ideas of wanting to be a doctor just came rushing back. >> reporter: and to make a long story short, the car doctor -- >> dr. carl allenby. >> reporter: -- is now a doctor doctor. last spring he graduated from northeast ohio medical university and today he's an emerge