[Isura]

Take a course in game theory. Maybe another in mathematical optimization or computer algorithms. Perhaps another in probability theory (taking a serious course in this will require a background in real analysis/measure theory). These topics can lead to many different career paths. Don't worry so much about choosing the right major. Just make sure to take enough challenging and interesting courses. Employers will want to see that you are capable of learning difficult material on your own, and can work well both independently and in groups. Any outside projects will help. Ask a prof about his research projects. Offer to help out in any way. You'll probably get stuck doing something not too deep like programming, but it is a good experience and you can get a feel for what interests you.