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.