Perturbative Calculations of Radiative B decay

The inclusive radiative B¯→Xsγ decay is accurately measured and provides important constraints on extensions of the Standard Model. Its rate is well approximated by the perturbatively calculable partonic b→Xspγ one. Up to four loops in perturbative QCD need to be included to match the current experimental precision. A brief description of the ongoing and completed calculations is presented here.