| Xingang Chen , Harvard University, , American, June 19-29, 2019 |
| Alireza Qaiumzadeh , Center for Quantum Spintronics-Norwegian University of Science and Technology, Trondhein, Norway, June 11 - July 4, 2019 |
| Alireza Qaiumzadeh , Norwegian University of Science and Technology, Trondheim, Norway, June 10-24, 2019 |
| Leili Javidpour , IPM, School of Physics, Tehran, Iran, May 22 - Aug. 6, 2019 |
| Ali Hassanali , The International Center for Theoretical Physics, Triest, Italy, April 27 - May 1, 2019 |
| Mahya Sadaghiani , Cologne Institute for Astrophysics, University of Cologne, , , April 24, 2019 |
| Artem R. Oganov , Skolkovo Institute of Science and Technology, Moscow, Russia, April 23-25, 2019 |
| Arman Shafieloo , Korea Astronomy and Space Science Institute (KASI), Daejeon, Korea, March 16, 2019 |
| Jérémy Fensch , European Southern Observatory - Garching, München, Germany, Feb. 16-24, 2019 |
| Palle Moller , ESO Headquarters, Garching, München, Germany, Feb. 15-23, 2019 |
| Benoît Epinat , Laboratoire d'Astrophysique de Marseille, Marseille, France, Feb. 15-25, 2019 |
| Hadi Rahmani , Paris Observatory, Paris, France, Feb. 14-23, 2019 |
| Edvige Corbelli , National Institute for Astrophysics(INAF), Rome, Italy, Feb. 14-25, 2019 |
| Arman Esmaili , Pontificia Universidade Catolica Rio de Janeiro, Rio de Janeiro, Brazil, Feb. 13-27, 2019 |
| Thomas Michely , Physikalisches Institut, Universität zu Köln, Cologne, Germany, Feb. 4-5, 2019 |
| Mohammad Asadi , Shahid Beheshti University, Tehran, Iran, Feb. 1 - Oct. 13, 2019 |
| Shinji Mukohyama , Yukawa Institute for Theoretical Physics (YITP), Kyoto University, Kyoto, Japan, Jan. 18-25, 2019 |
| Amin Farhang , University of Western Ontario (UWO), London, Canada, Jan. 9, 2019 |
| Pouya Bakhti , IPM, School of Physics, Tehran, Iran, Nov. 1, 2018 - March 20, 2019 |
| Moslem Ahmadvand , University of Shahroud, Semnan, Iran, Sep. 23, 2018 - Oct. 13, 2019 |
| Kamal Hajian , IPM, School of Physics, Tehran, Iran, Aug. 23, 2018 - March 20, 2019 |
| Farzad Omidi , IPM, School of Physics, Tehran, Iran, June 22, 2018 - July 1, 2019 |
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