Founder of a watchdog organization called Media Matters for America. Also a journalist and writer, he published a controversial, bestselling 1993 book entitled The Real Anita Hill.
In 1988, he graduated with a history degree from the University of California, Berkeley.
Originally a Republican, he later criticized conservative politics and shifted his own allegiance to the Democratic Party.
He was the son of adoptive parents Dorothea and Raymond Brook.
His biography of Hillary Clinton, The Seduction of Hillary Rodham, was published in 1996.