Dr. Luke, the producer and writer behind the mega hits from Britney Spears, Kesha, Taio Cruz and Katy Perry has signed an exclusive 5 year deal with Sony.

Sony’s CEO Doug Morris says this about Luke:

“He’s the best guy at the moment, as far as a writer and a producer. He and Jimmy (Iovine) are very different, but it’s the same kind of level of intellect and talent.”

Since Luke signed a deal with Sony, this means he can no longer work with Katy Perry who is signed to Capitol Records. He produced and co-wrote nearly all of Perry’s hits, including ‘Hot N Cold,’ ‘I Kissed a Girl,’ ‘California Gurls,’ ‘Teenage Dream,’ ‘E.T.’ and ‘Last Friday Night.’