There are two kinds of professors at UT. There are those who you ask for a position in their lab, and they tell you to take their course on whatever topic they’re teaching. If you do well in the course, or if the professor notices you, they’ll usually be willing to let you work with them. And then there are those who just give you a list of reading material and ask you to dive in right away. Pretty much every professor at UT is willing to give you a spot in their lab. All you have to do is ask.