| Yashar Akrami , Lorentz Institute for Theoretical Physics, Leiden University, , Netherlands, Sep. 12 - Oct. 12, 2018 |
| Nasim Bozorgnia , IPPP, Durham University, Durham, UK, March 21 - April 20, 2018 |
| Daniel Grumiller , Technical University of Vienna, Vienna, Austria, Feb. 19-27, 2018 |
| Seyed Amir Bahrani , University of pParis Diderot, Paris, France, Dec. 27, 2017 - Jan. 10, 2018 |
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