I am interested in biotech and nanotech and cellular engineering primarily. After graduation I am definitely going to grad school possibly for MD/PhD. My main career goal is to do research, but ideally I would be head of a start-up company. So my question is which is probably a better complement to my current primary major, chemical engineering, math or biochemistry. I had initially picked biochemistry but now I think the math might be more useful. What is everyone else's opinion? Which ever I choose as my second major the other field could be taken as a minor also.