... I am a postdoc in the Cambridge Planck Analysis Centre (CPAC), based in the Cavendish Astrophysics Group and the Institute of Astronomy . CPAC is a contributor to the simulations and data analysis for ESA 's Planck mission. ... Previously, as a graduate student I researched the applications of geometric algebra to theoretical physics and mathematics. ... You can find out more about geometric algebra from the Geometric Algebra Group web page . Mark Ashdown - maja1@mrao.cam.ac.uk ...