Just celebrated my second appointment with Katie. I have medium brown hair with some gray, but I also have ash blonde highlights...very difficult to keep looking natural. On my first appointment several months ago, Katie slightly changed the blonde formula to a more becoming color, and blended it with lowlights (to complement my gray and brown) so the grow out is hardly noticeable. She is truly a "Master of Color!!!" I had so many compliments after my first appointment that I have decided to keep Katie FOREVER as my stylist. She does great cuts as well. You should know that a great colorist will not get you in and out quickly...they will take their time to ensure that your color comes out perfectly, checking the chemical process inside the foils periodically. It is a 3-hour appointment for me since I have a ton of hair (about 70 foils!!!) and it takes awhile for the color to "come up"....but so incredibly worth it. I've paid much, much more in other salons only to be disappointed and feel ripped off. I highly recommend Katie...she is such a pro!