Speaking for the first time, Dr Kristi Funk of the Pink Lotus Breast Center in Beverly Hills, who treated Jolie, 38, said the actress waited for a perfect time go public, reported People magazine quoting Los Angeles magazine.
The Oscar winner opted for the operation earlier this year after genetic tests showed that she had a high risk of developing breast cancer. Her mother, Marcheline Bertrand, died of ovarian cancer in 2007 at the age of 56.
"She is intensely private, but she calculated the moment when she would be ready to reveal something so personal."
Funk says Jolie's honesty about the surgery helped raise awareness about breast cancer and the faulty gene, BRCA1 and BRCA2.
"When someone who is arguably the most beautiful woman in the world removes the part of her body that is symbolic of femininity and sexuality, you have to say, 'Why would she do that?'.