In more than three decades of producing, Foster has collaborated with other iconic female artists, including Barbara Streisand, Celine Dion, Diana Ross and Natalie Cole, but Houston, he said, was a music "genius" in her own right. Their last collaboration together was on Houston's 2009 single, "I Didn't Know My Own Strength" -- her last hit released before her death.
"Celine would give me exactly what I asked for, which just thrilled me, as an egotistical record producer. Thank you, Celine," Foster said. "When I would ask Whitney to do that, she would give me something different than I asked for. And 99 percent of the time, it would be something better than what I asked for... that was the genius, part of the genius, of Whitney Houston."