Celebrating OprahDr. Mehmet Oz! Rachael! See who (and what!) the media mogul has made famous

2 of 11

RACHAEL RAY

The plucky, popular Food Network host scored her own deal with Winfrey's star-making Harpo Productions in 2005, promoting her eponymous show with appearances on Winfrey's own talk show. "Rachael's energy and ability to connect with her audience are why she's such a hit," Winfrey tells PEOPLE of her protégé, who went on to win an Emmy and (just like Oprah) launch her own magazine, Every Day with Rachael Ray.