Not usually.
Most people coming to me for repair work are looking for 'Leaded Stained Glass' repair, which is a different discipline to what I do. I was trained in Copperfoil aka Tiffany Stained Glass which is a more modern style of Stained Glass. Although I don't usually repair Tiffany Glass either as I wasn't trained in restoration, I will however take a look and tell you if I think I can or cant fix it. I will fix any of my own products of course.
A handy website to try is The Irish Glass Road where you can search for glass artist all over the country. It has information about what each glass artist does including repair work.
If you're unsure of what type of glass you have send me a picture of it and I can advise you on the best course of action.