ISO gray blending specialist

I'm a woman of a certain age (and that age is 40, lol). I've been graying since my 20s and although I'm still far from salt-and-pepper it's definitely getting more noticeable. I'm happy to go gray but I still want to look polished while I do it. Can any of you recommend a gray blending specialist? I asked my regular stylist but she didn't really know.