Knoepfle wanted to help Sony/ATV writer Jack Antonoff of Bleachers and fun. achieve one of his creative goals: to collaborate with another artist. And what a collaboration it was. Antonoff co-wrote three songs on Taylor Swift's mega-selling 1989. Knoepfle, who was promoted in September, now jointly runs Sony/ATV's Los Angeles office with Jonas Kant, senior vp business and legal affairs. She's involved in all the publisher's deals, from both a creative and business perspective.