(In order by starting date)
| 2019 | ||||
| Name | Affiliation | From | To | Office |
| Xiao Hu | NIMS, Japan | Dec. 15, 2019 | Jan. 5, 2020 | N206 |
| Xi-Nan Zhou | Princeton | Dec. 24, 2019 | Jan. 5, 2020 | S401-4 |
| Tian Lan | Univ. of Waterloo | Dec. 24 | Dec. 27 | |
| Hua-Jia Wang | KITP, UCSB | Dec.9 | S401-2 | |
| Hui-Ke Jin | Zhejiang Univ. | Mar.10, 2019 | Jul. 1, 2020 | A-II-204 |
| Honghao Song | Zhengzhou Univ. | Oct. 22, 2019 | Sep. 1, 2020 | S401-7 |
| Masahiro Tatsuno | ISSP, Japan | Jul. 16 | Jul. 23 | |
| Takeo Kato | ISSP, Japan | Jul. 16 | Jul. 23 | |
| Daigo Oue | Imperial College London | Jun. 29 | Jul. 7 | |
| Hua-Jia Wang | KITP, UCSB | Jun. 23 | Jun. 24 | |
| Xiao Hu | NIMS, Japan | Jun. 22 | Jul. 4 | |
| Hua-Jia Wang | KITP, UCSB | Jun. 18 | Jun. 20 | |
| Hua-Jia Wang | KITP, UCSB | Jun. 11 | Jun. 13 | |
| Sadamichi Maekawa | RIKEN | Jun. 9 | Jun. 12 | |
| David. S. Dean | Bordeaux | May 7 | May 25 | |
| Sadamichi Maekawa | RIKEN | Apr. 29 | May 2 | |
| Kung Yang | FSU | Apr. 27 | May 29 | |
| Daigo Oue | Imperial College London | Apr. 20 | Apr. 28 | |
| Cheng-Xiang Ding | AHUT | Apr. 19 | Apr. 23 | |
| Yasumasa Tsutsumi | RIKEN | Apr. 17 | Apr. 20 | |
| Sadamichi Maekawa | RIKEN | Apr. 17 | Apr. 20 | |
| Hua-Jia Wang | KITP, UCSB | Apr. 1 | Apr. 3 | |
| Sadamichi Maekawa | RIKEN | Mar. 26 | Mar. 29 | |
| Hua-Jia Wang | KITP, UCSB | Mar. 21 | Mar. 22 | |
| David. S. Dean | Bordeaux | Mar. 11 | Mar. 29 | |
| Takeo Kato | ISSP, Japan | Feb. 27 | Mar. 6 | |
| Fujimoto Junji | RIKEN | Feb. 25 | Feb. 27 | |
| Xiao Hu | NIMS, Japan | Feb. 27 | Mar. 5 | |
| Yin-Yi Huang | Maryland | Feb. 7 | Mar. 3 | |
| Hua-Jia Wang | UCSB | Jan. 21 | Jan. 25 | |
| Robert J. Joynt | Wisconsin U | Jan. 8 | Jan. 22 | |
| Yin-Yi Huang | Maryland | Jan. 7 | Jan. 31 | |
| Shun-Qing Shen | HKUST | Jan. 6 | Jan. 11 | |
| Zheng Zhu | Harvard | Jan. 2 | Jan. 31 | |
| Tian-Ci Zhou | KITP, UCSB | Jan. 2 | Jan. 5 | |
