2018

• Maulik Parikh (Arizona State University) 24/09-28/09
• Stefano Ettori (INAF-Observatory Bologna) 1/02-2/02

2017

• Doddy Marsh (King’s College London) 8/05-11/05
• Diego Blas (CERN) 1/05-30/05
• Glenn Starkman (CERCA-Case Western Univ.) 31/01-03/02

2016

• Ichihiko Hashimoto (Yukawa Institute, Kyoto University) 15/02-12/03
• Charling Tao (THCA-Beijin) 28/01-29/01
• Stefano Anselmi (CERCA-Case Western Univ.) 15/01-19/01

2015

• Stefano Ettori (INAF-Observatory Bologna) 12/02-13/02

2014

• Camilla Penzo (Univ. Heidelberg) 19/11-21/11
• Mohammed Irshad (Univ. Zurich) 26/11-28/11
• Bruce Bassett (SAAO & University of Cape Town) 01/09-28/09
• Subinoy Das (Univ. Bangalore) 01/09-14/09
• Andrea Lapi (SISSA) 02/06-06/06
• Thomas Kitching (Univ. Coll. London) 24/03-25/03
• Benoit Famaey (Obs. Strasbourg) 18/03-19/03
• Marcello Musso (Univ. Louvain) 28/01-29/01

2013

• Ilia Musco (SISSA – Trieste) 3/12-7/12
• Bruce Bassett (SAAO & University of Cape Town) 20/09-20/10
• Ravi Sheth (U. Penn. & ICTP – Trieste) 19/06-27/06
• Valerio Marra (ITP – Univ. Heidelberg) 04/06-07/06
• Subinoy Das (ITPPC – Univ. Aachen) 27/05-29/05
• Luciano Casarini (Univ. Federal do Espírito Santo – Victoria) 18/04-20/05