But whether you're new to Foster or you know why he won every one of his GRAMMYs, you likely don't know the longtime music producer's whole story. He has, after all, been in the biz since the '70s. Foster has worked with Josh Groban, Andrea Bocelli, Jennifer Lopez, Rod Stewart, Madonna, Christina Aguilera and more. He's Canadian. He's been married four times. His connection to Brody Jenner is deeper than you think.