Private tennis coach for a 13-year-old

My 13-year-old has taken tennis group lessons and attended summer camps. He enjoys playing, is at the beginning-intermediate level, and wants to get better. Right now, my kid isn't aiming to play competitive tennis but just wants to have a good foundation to build on. I am interested in finding a private tennis coach to work with him on proper mechanics. If you know of coaches who work well with young teens, please let me know. Thank you!