Christian Jacobi received both his M.S. and Ph.D. degrees in computer science from Saarland University, Germany, in 1999 and 2002, respectively. He joined IBM Research and Development in 2002, working on floating-point implementa- tion for various IBM processors. For IBM’s System z10 mainframe, he worked on the L1.5 cache unit. From 2007 to 2010, Dr. Jacobi was on international assignment to Poughkeepsie, NY, where he worked on the Load-Store-Unit for the IBM zEnterprise 196 mainframe. Dr. Jacobi is now responsible for the cache design of IBM’s mainframe processors, and for future architecture extensions.