John Landis, director of the "Thriller" video:

"I was lucky enough to know and work with Michael Jackson in his prime.  Michael was an extraordinary talent and a truly great international star.  He had a troubled and complicated life and despite his gifts, remains a tragic figure.  My wife Deborah and I will always have great affection for him."

Quincy Jones:

“I am absolutely devastated at this tragic and unexpected news. For Michael to be taken away from us so suddenly at such a young age, I just don’t have the words. Divinity brought our souls together on The Wiz and allowed us to do what we were able to throughout the 80’s. To this day, the music we created together on “Off The Wall,” “Thriller” and “Bad” is played in every corner of the world and the reason for that is because he had it all…talent, grace, professionalism and dedication. He was the consummate entertainer and his contributions and legacy will be felt upon the world forever. I’ve lost my little brother today, and part of my soul has gone with him.”

Michael Levine, former Michael Jackson publicist:

"As someone who served as Michael Jackson's publicist during the first child molestation incident, I must confess I am not surprised by today's tragic news. Michael has been on an impossibly difficult and often self-destructive journey for years. His talent was unquestionable but so too was his discomfort with the norms of the world. A human simply can not withstand this level of prolonged stress."