Helen Thomas

During the years Helen Thomas covered President Kennedy, she was the first woman to close a presidential news conference with the traditional "Thank you, Mr. President."

Thomas served as President of the Women's National Press Club in 1959 - 60, and she was the first woman officer of the National Press Club after it opened its doors to women members for the first time in 90 years. In addition, Thomas became the first woman officer of the White House Correspondents Association in its 50 years of existence, and served as its first woman president in 1975-76. Thomas also became the first woman member of the Gridiron Club in its history, and the first woman to be elected President in 1993.

Here is more about her.