Kavli Institute For Cosmology, Cambridge, UK, 2012 – 2016.
Cavendish Laboratory University of Cambridge, UK, 2010 – 2011.
Texas Cosmology Center, USA, 2009.
Astronomy Centre University of Sussex, UK, 2008.
Instituto de Astrofisica de Canarias, Spain, 2007.
Laboratoire de Physique Subatomique et Cosmologie, France, 2006.