1 Read / Add Comments The mastermind set to take over what would be one of the world’s largest entertainment conglomerates got his start as a high school graduate of New York's Hudson Valley. On Monday, May 17, AT&T and Discovery announced an agreement to combine WarnerMedia’s assets with Discovery’s businesses to create a standalone entertainment company that will be led by Discovery CEO David Zaslav, a graduate of Ramapo High School in Rockland County. Born in Brooklyn in 1960, Zaslav moved to the Hudson Valley at the age of 8. He was a captain of the Ramapo High School varsity tennis team.