for what my opinion is worth,
a significant factor in making this a success story
is about the specific job environment and requirements.
As in: a certain pitch and tone of voice for radio announcers.

Radio broadcasts have always favored voices that are deep and resonant.
When this CBS radio broadcaster began, as Scott Eck,
he had a man's deep voice, and it was also a voice
that was smooth, even, and personable.
This may be true of television broadcasting, I'm not certain;
but in radio, it is definitely true
that the type of voice trumps the gender of the announcer!
How often have you heard a woman announcer on the air
whose voice is a low deep one? In my experience (volunteer work as
an announcer at a classical-music radio station),
women with such throaty, deep voices are much in demand on the radio.

Kristen Eck, I can personally testify, sounds exactly the same
on the air, on my car radio (which is a rotten radio by the way)
as Scott Eck sounded back in the day.