I am a current Mathematics Ph.D. student in my first year. In undergrad, by far the best way to spend a summer was doing research, and there were no shortage of programs to apply to. Now that I'm in grad school though, I don't even know where to start looking. What sort of research programs should I be looking for in order to advance my career? Are there any in particular you would recommend? I mostly specialize in Algebra and Combinatorics, and am currently at a northwestern US school.