I had the Knee rolls redone by my local saddle maker!
I'm getting a tear repaired on my saddle hopefully today. I'm going to a saddle repair and custom making saddle shop. They do anything!
I've had saddles repaired at professional saddle meanders. They will do everything from sewing leather to replacing trees.
I agree with Melinda (once again :)) but a shoemaker can also do it, they can prepare and work with every kind of leather!
If I had to make my saddle repaired, I'd do it to the saddle's brand, too dangerous and so you'll get a guarantee of it! Be careful!