How do you like working in OR? Are there a lot of jobs in the field? I'm a math major and like programming, so it seems like it'd be an interesting career for me.
Of course some people are doing OR but don't know they're doing it. Some just use another label. Other useful search terms include "management science", "operational research" (UK), "advanced analytics", and of course "optimi(s||z)ation".
If you're after an introductory text I can recommend Wayne Winston's Operations Research: Applications and Algorithms. 4th edition. ISBN-13: 978-0534380588