The publishing and editorial teams would like to thank the following, for their invaluable service as 2021 reviewers for this journal. We are very grateful for the contributions made. With their help, the journal has been able to publish such high-quality articles:
| Abdekhoda, Mohammadhiwa |
| Abdullah, Noorhidawati |
| Acheampong, Ebenezer |
| Adams, Richard |
| Adeyemi, Ismail |
| Adomi, Esharenana |
| Adu, Kofi |
| Aharony, Noa |
| Akca, Sumeyye |
| Albuquerque, Otávio |
| Alcaraz Martínez, Rubén |
| Ali, Irfan |
| Ali, Muhammad Yousuf |
| Allen, Ryan |
| Amjad, Tehmina |
| Arroyo-Vázquez, Natalia |
| Asemi, Asefeh |
| Ashibani, Yosef |
| Aslam, Sana |
| Atele-Williams, Tosan |
| Au, Cheuk Hang |
| Awais, Sania |
| Babatope, Ihuoma |
| Badurina, Boris |
| Bai, Yun |
| Bail, Rosangela |
| Ball, Liezl |
| Basha, Dr. Imtiaz |
| Batool, Syeda |
| Bharti, Neelam |
| Bird, Nora |
| Bishop, Bradley |
| Bogdanović, Zorica |
| Bomhold, Catharine |
| Borrego, Ángel |
| Buchanan, Heidi |
| Bueno de la Fuente, Gema |
| Çakmak, Tolga |
| Calvert, Kristin |
| Ch., Aswani Kumar |
| Chan, Frank K. Y. |
| Chang, Chen-Chi |
| Chang, Chung |
| Chang, Jiawei |
| Chang, Jui-Hung |
| Chang, Jung Jung |
| Chang, May |
| Chang, Victor |
| Chang, Wei-Lun |
| Chen, Chia-Chen |
| Chen, Chin-Yi |
| Chen, Hong-Ren |
| Chen, Hsin-liang |
| Chen, Hsuanwei |
| Chen, Jing |
| Chen, Min |
| Chen, Po-Yen |
| Chen, Ruey-Shun |
| Chen, Ye |
| Chen, Yijin |
| Cheng, Fei-Fei |
| Cheung, Yat Ming |
| Chiang, Chang-Tang |
| Chien, Wei-Che |
| Chiou, Chei-Chang |
| Chiu, Po-Sheng |
| Chohan, Sohail Raza |
| Chohda, Nirupma |
| Chong, Dazhi |
| Chow, Anthony |
| Chuang, Yung-Ting |
| Coghill, Jeffrey |
| Colegrove, Patrick |
| Cook, Matthew |
| Cummings, Joel |
| Das, Subhashis |
| De Beer, Koos |
| Delgado Gallegos, Juan Luis |
| Deng, Yaochen |
| Dokhani, Firoozeh |
| Drake, Paul |
| Ebrahimi, Fezzeh |
| Efendi, Ferry |
| Emami, Maryam |
| Enwald, Heidi |
| Eslen-Ziya, Hande |
| Fantinato, Marcelo |
| Fourie, Ina |
| Galvin, Denis |
| Ganesan, Perumal |
| Gladence, Mary |
| Gui, Ping |
| Guleria, Deepa |
| Gupta, Saumya |
| Hamad, Faten |
| Han, Lifeng |
| Handfield, Amy |
| He, Daqing |
| Ho, Roger C. M. |
| Horton, Jennifer |
| Hosseini, Elaheh |
| Hou, Xiaorong |
| Hsiao, Kuo-Lun |
| Hu, Weifeng |
| Hu, Xiao |
| Hu, Yuxi |
| Huang, Ching-Fei |
| Huang, Hsieh-Hong |
| Huang, Kun |
| Huang, Kuo-Liang |
| Huang, Qiao |
| Huang, Ruhua |
| Huang, Xiaozhong |
| Hung, Patrick |
| Ip, Rachael |
| Ismail, Waidah |
| Janavi, Elmira |
| Javed, Saad Ahmed |
| Jett, Jacob |
| Jiang, Ying |
| Jiang, Zhehan |
| Kammer, Jenna |
| Kateeb, Elham |
| Kaur, Tarandeep |
| Keshavarz, Hamid |
| Khan, Muzammil |
| Kiani, Masoome |
| Kiapasha, Zohre |
| Kim, Castle |
| Kim, Changju |
| Kim, Jae Sung |
| Kim, Meen Chul |
| Kim, Youngseek |
| Korchi, Adil |
| Kostagiolas, Petros |
| Kowalik, Eric |
| Kumar, Akshay |
| Lai, Chin-Feng |
| Lai, Jung-Yu |
| Lam, Carmen |
| Lam, Ernest |
| Lam, Ki Tat |
| Lee, Pei-Chun |
| Lei , Yaqin |
| Lei, Lei |
| Li , Xizhen |
| Li, Kang |
| Li, Kongqing |
| Lian, Jiunn-Woei |
| Liang, Shaobo |
| Liao, Chien Hsiang |
| Lin, Chi-Shiou |
| Lin, Chien-Liang |
| Lin, Chun-Min |
| Lin, Hao-Chiang Koong |
| Lin, Hsin-Hsin |
| Lin, Pei Hsuan |
| Lin, Rebecca |
| Lin, Ting-Lan |
| Liu, Guifeng |
| Liu, Lisu |
| Liu, Ming-Chi |
| Liu, Yunmei |
| Lu, Zhenbo |
| Lund, Haakon |
| Ma, Feicheng |
| Ma, Will W.K. |
| Maceli, Monica |
| Madalli, Devika |
| Mahmood, Khalid |
| Marques Peres, Sarajane |
| Maslikovic, Dejan |
| Matthews, Joseph |
| McKay, Daniel |
| Natarajan, Radhakrishnan |
| Nguyen, Tran Hung |
| Noh, Younghee |
| Noruzi, Alireza |
| Oguz, Fatih |
| Pakdaman Naeini, Maryam |
| Pangelinan, Perry |
| Park, Eunil |
| Paulino, Yvette |
| Pennington, Diane |
| Pirozelli, Paulo |
| Priscilla Wheler, Anna |
| Radio, Erik |
| Rafi, Muhammad |
| Rafi, Muhammad |
| Rehman, Umair |
| Richtig, Georg |
| S. Siriweera, T. H. Akila |
| San Nicolas, Roland |
| Sarwar, Raheem |
| Seadle, Michael |
| Semeler, Alexandre |
| Shah, Muhammad Umair |
| Shen, Chien-wen |
| Singh, Jaiteg |
| Singhal, Mohit |
| So, Haggen |
| Soroya, Saira |
| Souri, Alireza |
| Stephen Olatunde, Olabiyisi |
| Su, Yu-Sheng |
| Suez-Sales, Martha |
| Sun, LiBo |
| Tang, Jeff K.T. |
| Tang, Kai-Yu |
| Tsai, Yung-Shun |
| Tsuji, Mineo |
| Ur-Rehman, Inayat |
| Varnum, Ken |
| Vílchez-Román, Carlos |
| Vrana, Radovan |
| Wang, Chunwei |
| Wang, Bevin |
| Wang, Dan |
| Wang, Di |
| Wang, Hai |
| Wang, Lin |
| Wang, Xu |
| Wójcik, Magdalena |
| Wong, Ka Wai Gary |
| Wu, Cheng-Feng |
| Wu, Chin-Shan |
| Wu, Dan |
| Wu, Hsin-Te |
| Wu, Jiang |
| Wu, Ko-Chiu |
| Wu, Zongda |
| Xiao, SiZhe |
| Xie, Tianling |
| Xin, Chengyao |
| Xu, Qiaoyun |
| Yan, Chunlai |
| Yang, Chao |
| Ye, Xindong |
| Young, Scott |
| Yu, Fei |
| Yu, Hsin-Chun |
| Yuan, Chien Wen (Tina) |
| Zahary, Ammar |
| Zha, Xianjin |
| Zhang, Chenwei |
| Zhang, Kai |
| Zhang, Shuai |
| Zhang, Yan |
| Zhang, Yiwen |
| Zhang, Zhang |
| Zhong, Hua-Xu |
| Zhou, Chi |
| Zhu, Haoran |
| Zou, Lixue |
| Zou, Ning |
| 何, 琳 |
| 耿, 穎 |
| 郭, 进京 |