Constance Spry, Pru Leith, Caroline Waldesgrave, Mary Berry, Kenneth Lo, Madhur Jaffrey, to pick half-a-dozen names at random from the bookshelf. As I rarely if ever watch terrestrial television, I have no idea whether these all qualify as "media chefs", but all have most definitely made their mark in the culinary world. Along with "Practical Professional Cookery", the first three form my first line of reference whenever I need an authoritative source for a western dish.
** Phil.