Also known under the pseudonym, Cherry Cherry Boom Boom is head of A&R at Interscope Records and president of Interscope's subsidiary imprint Cherrytree Records. He is a songwriter and producer as well as A&R for t.A.T.u., Sting, Keane West, and Feist. He had produced Lady Gaga's first live EP, The Cherrytree Sessions. From 2008 to 2010, Kierszenbaum was one of the two A&R of Lady Gaga. From 2011 to onward, Kierszenbaum continues to work with Lady Gaga as Interscope's head of international.