If you don't believe me, watch her hands
I can tell who has a very poor television presence: Debbie Fields of Mrs. Fields. Yes, she is lovely, well put together and perky. However, when she is 'cooking' she spends an inordinate amount of effort preserving her manicured nails. Her hand movements are so stiff and everything seems new-to-her and ackward, it is difficult to believe she cooks with any regularity. I have to turn off the television.
I do enjoy watching Jacque Pepin cook with his daughter Claudine. There are moments when you can see he is getting royally ticked off and cannot make the quick irritable comment he really wants to make. As one of the most impatient teachers around, I fully understand his desire to spit tacks if the camera would just drift away for a moment.
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As for Julia Child, she was in the right place at the right moment. Her book came out during the Kennedy Administration when Jackie as a young First Lady took Washington by storm. She not only redecorated the White House with period furniture, she hired a French chef to refine the formal menus. Julia Child happened to be properly situated to ride the tide of this revived enthusiasm for French food and desires to really learn to cook.
There were people just as worthy as Julia, such as Chicago's
Alma Lach whose tomes on French cooking were published just prior to this time. In the timing is everything department, she missed the boat of the wider popular culture. I happened to read about her when in high school and obtained her book, which I used as a teaching manual for a while.
You may be rather surprised, but there were many people in professional cooking circles who felt Julia Child was an inferior cooking talent. Julia was not considered a Chef. Interestingly neither did Julia consider herself a Chef; rather she identified herself as a cook. I was quite stunned the first time I encountered this opinion of Julia as inferior cooking talent. However, it was not unique to this person as I later heard these same sentiments from a number of others. I have a better understanding where they come from, however these same (critical) people could not inspire anyone else to cook.
So if Julia was responsible for inspiring a cooking muse in people, then that by itself is quite a gift. Though I would hardly consider this ability to inspire a one-of-a-kind unique experience. Julia had her moment in time, like Francois and Antoinette Pope or Epicius had theirs. All contributed in their day an inspiration to cook and eat well.