I no longer have a specific name I can give you, but another resource is the Aggie Swim club and/or the Bryan/CS parks as some of their instructors provide private lessons or sometimes they know private instructors who have their Water Safety Instructor's certification.
Usually a few posters have names of folks, but the person I knew graduated.
FWIW, we did various lessons through the CS parks and Tsunamis and our kiddos enjoyed it immensely, especially the summer swim team-we kept it low key and they became confident capable swimmers with knowledge about how to be safe in and around water. We also did a summer with private instruction when the classes weren't going to work out.
Best of luck to you and have a great summer in the water!