This may be the person in the video:
Wanted by the FBI...
http://64.233.167.104/search?q=cache:afkTX8E5gk4J:www.fbi.gov/terrorinfo/gadahn.htm+Adam+Yahiye+Gadahn&hl=en
Becoming Muslim...
Yahiye Adam Gadahn
Islam does not believe that all men are doomed to Hell unless they simply accept that God (apparently unable to forgive otherwise) magnanimously allowed Himself to be tortured on a cross to enable Him to forgive all human beings who just believe that He allowed Himself to be tortured on a cross...
http://64.233.167.104/search?q=cache:7oEjcdCXgYEJ:www.witness-pioneer.org/vil/Articles/stories/yahiye.html+Adam+Yahiye+Gadahn&hl=en
GARDEN GROVE, Calif. - Adam Yahiye Gadahn was 17 years old when he walked into the Islamic Society of Orange County and asked for permission to worship there. The farm kid who grew up in a home with Christian roots declared himself a Muslim, ready to immerse himself in his new religion.
But his devotion eventually spiraled into trouble and an arrest.
Gadahn, who was named Wednesday as one of seven suspected al-Qaida operatives sought by the FBI, was later expelled from the mosque after attacking an employee. Records show he pleaded guilty to assault and battery charges in June 1997 and was sentenced to two days in jail and 40 hours of community service. ...
He was becoming very extreme in his ideas and views, said Muzammil Siddiqi, the societys religious director. He must have disliked something.