Caltech has appointed new leadership to the Walter Burke Institute for Theoretical Physics and the Leinweber Forum for Theoretical Physics. Xie Chen , the Eddleman Professor of Theoretical Physics, has become the director of the Walter Burke Institute for Theoretical Physics after its former director, Hirosi Ooguri, the Fred Kavli Professor of Theoretical Physics and Mathematics, moved into a new position as the Kent and Joyce Kresa Leadership Chair of the Division of Physics, Mathematics and