Journalism Callahan began working for
Sassy magazine and
MTV at age 17. Callahan worked as a writer, editor, and later columnist for the
New York Post from 2002 to September 2022. She has worked as a columnist for
Daily Mail since October 2022. She received an
ASCAP Deems Taylor Award as co-author of "Don't Drink the Brown Water", a piece in
Spin magazine about what led to riots and violence at
Woodstock '99. Callahan was interviewed as part of
Woodstock 99: Peace, Love, and Rage, a documentary produced by
HBO. In 2016,
Irish America listed Callahan as one of its "Top 50 Power Women". It became an instant
New York Times bestseller, a nominee for the Edgar Award for Best Fact Crime and winner of France's Grand prix de littérature policière. In 2024, Callahan published
Ask Not: The Kennedys and the Women They Destroyed.
Ask Not became an instant
New York Times bestseller and charted as #1 on the
UK Sunday Times Bestsellers List upon release. It also became an
Irish Times bestseller. Along with
Megyn Kelly, who called it "
the book of the summer" in June 2024,
Ask Not has been listed as a Top 20 Summer read by
Town & Country,
The Sunday Independent,
Glamour UK, and
Mail on Sunday.
The Observer praised the book as "a timely reminder of the dangers posed by men who crave power."
Podcast In 2025, Callahan launched her
podcast,
The Nerve, following multiple appearances on
The Megyn Kelly Show. The podcast is part of journalist and podcast host Megyn Kelly's MK Media network, in which Callahan discusses celebrity gossip, popular culture, and true crime. ==Bibliography==