Rosenberg is credited by some as the creator of the zone blitz defense made popular by the Pittsburgh Steelers.
In 1983, he was an assistant coach with the Philadelphia Stars in the first year of the United States Football League (USFL).
Jim Mora Sr. was head coach and Carl Peterson, former president of the Kansas City Chiefs, was the general manager.
In 2004, he coordinated the defense of the Braunschweig Lions, Germany's most winning team with many German Bowl appearances and ten National Championships.
Rosenberg received a bachelor's degree from Harvard University, where he studied social psychology and organizational behavior.
He now lives in Los Angeles, California where he has done some writing and editing for films and television projects with football themes.