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:

• Abdullah, Azween
• Abdullah, Mohd Fahmy
• Aboelmaged, Mohamed
• Agrawal, Nishant
• Agrawal, Tarun
• Ahmad, Wasim
• Ainin, Sulaiman
• Aisaiti, Gulizhaer
• Akter, Shahriar
• Ala, Ali
• Alam, Md. Zahid
• Albizri, Abdullah
• Aldieri, Luigi
• Ali, Imran
• Ali, Mohd Helmi
• Ali, Syed Mithun
• Alos-Simo, Lirios
• Aw, Eugene
• Azhdari, Behnam
• Bala, Pradip Kumar
• Balashunmugaraja, B.
• Balezentis, Tomas
• Balodi, Krishna
• Basant Kumar, Verma
• Belo, Orlando
• Bérard, Céline
• Bharathi S., Vijayakumar
• Bhuvanesh Kumar, M.
• Bian, Yiwen
• Bian, Yiyang
• Binu, D.
• Bojnec, Štefan
• Borsato, Milton
• Bouloiz, Hafida
• Brian Kim, Taesung
• Cai, Shun
• Cai, Zhao
• Camarinha-Matos, Luis
• Campuzano-Bolarin, Francisco
• Candi, Marina
• Cao, Zhiguang
• Chai, Junyi
• Chalmeta, Ricardo
• Cham, Tat-Huei
• Chan, Hing Kai
• Chan, Jin Hooi
• Chan, Tommy K. H.
• Chang, Shuchih Ernest
• Chang, Younghoon
• Chargui, Tarik
• Cheah, Jun-Hwa
• Chen, Chiwei
• Chen, Chuanhong
• Chen, Jengchung
• Chen, Jin
• Chen, Jinliang
• Chen, Lujie
• Chen, Meng
• Chen, Minghong
• Chen, Ping-Kuo
• Chen, Poyen
• Chen, Rong-Huei
• Chen, Si-Hua
• Chen, Yao
• Chen, Yin-Ju
• Chen, Yongtong
• Chen, Yuangao
• Cheng, Yang
• Chin, Eric
• Chiu, Weisheng
• Cho, Sunah
• Choi, Jaewon
• Chong, Woon Kian
• Chowdhury, Mesbahuddin
• Chuah, Stephanie Hui-Wen
• Chun, Heuiju
• Chung, Sai Ho
• Cohen, Jason
• D'itri, Michael
• Dahana, Wirawan
• Dal Forno, Ana Julia
• Dastmalchi, Lale
• De Ávila, Rodrigo
• Dehghani, Milad
• Desmarchelier, Benoît
• Díaz-Fernández, María
• Ding, Peiqi
• Diong, Li
• Dong, Guoshu
• Du, Helen
• Du, Yue
• Dubey, Rameshwar
• Dugarte Peña, German Lenin
• Dutta, Shantanu
• Dyczkowski, Tomasz
• Escorcia-Caballero, Juan
• Fan, Jun
• Fan, Tijun
• Fang, Bin
• Fang, Weiguo
• Farzipoor Saen, Reza
• Fathi, Kiamars
• Feng, Taiwen
• Feng, Xuehao
• Fildes, Robert
• Filieri, Raffaele
• Fiorini, Paula
• Foo, Pik-Yin
• Foroughi, Behzad
• Franco, Matheus
• Fu, Shaoling
• Fu, Xiaokang
• Fuentes, Maria
• Gallab, Maryam
• Gan, Hongcheng
• Gao, Benhe
• Gao, Shang
• Godinho Filho, Moacir
• Gómez-Carmona, Diego
• Gong, Xiuyuan
• Gong, Yu
• Gonzalez, Reyes
• Gou, Juanqiong
• Green, Ken
• Gu, Minhao
• Gu, Qiannong
• Gu, Xiaoyu
• Guan, Xu
• Guan, Xu
• Guan, Zhengzhi
• Guo, Lingbo
• Guo, Yong-Fang
• Gupta, Ajay
• Gupta, Rohit
• Gupta, Swati
• Guthrie, Cameron
• Haapasalo, Harri
• Ham, Juyeon
• Hamouda, Manel
• Han, Zhaojun
• Haq, Muhammad Zia Ul
• Harfouche, Antoine
• Helms, Marilyn
• Helo, Petri
• Herrada-Lores, Sara
• Hew, Jun-Jie
• Hew, Jun-Jie
• Hew, Teck-Soon
• Hilletofth, Per
• Hilmola, Olli-Pekka
• Hlee, Sunyoung
• Ho, Jessica Sze Yin
• Ho, Ree Chan
• Hou, Fangfang
• Hsu, Chia-Shiang
• Hsu, Li-Chun Hsu
• Hu, Chih-Hsiung
• Hu, Jiawen
• Hu, Jiayao
• Hu, Wenjin
• Hu, Yaou
• Hu, Yueqiu
• Hua, Xiuping
• Huang, Kai
• Huang, Yun
• Hubona, Geoffrey
• Huo, Jiage
• Huo, Michael
• Hyun, Youyung
• Inman, R. Anthony
• Ismail, Zul-Atfi
• Ivanov, Stanislav
• Jeon, Seongmin
• Ji, Xiang
• Jia, Fu
• Jia, Lin
• Jia, Qiong
• Jiang, Hemin
• Jiang, Jiang
• Jiang, Nan
• Jiang, Yangyang
• Jin, Minyue
• Jonek-Kowalska, Izabela
• Juntunen, Jouni
• Kala Kamdjoug, Jean Robert
• Kalantari, Taher
• Kamble, Sachin
• Kang, Yuanfei
• Kanjanabootra, Sittimont
• Keogh, John
• Kess, Pekka
• Khong, Kok Wei
• Kian-Yeik, Koay
• Kim, Hyerhim
• Kim, Sodam
• Kong, Xiangtianrui
• Koohang, Alex
• Kumar, Anup
• Kumar, Maneesh
• Kumar, Sameer
• Kuo, Yen-Ku
• Kwok, Andrei
• Lacka, Ewelina
• Lai Wan, Wong
• Lam, Cathy H. Y.
• Lan, Shulin
• Lawson-Body, Assion
• Lee, Angela
• Lee, Boon Giin
• Lee, Carman
• Lee, Gunwoong
• Lee, Hwansoo
• Lee, In
• Lee, Neil Chueh-An
• Lee, One-Ki Daniel
• Lee, Paul Tae-Woo
• Lee, Seoyoun
• Lee, Voon Hsien
• Lee, Voon-Hsien
• Lee, Zach W. Y.
• Leem, Byunghak
• Lei, Chun Fong
• Leong, Lai Ying
• Leong, Lai Ying
• Leow, Fui-Theng
• Lesjak, Dušan
• Li, Daifeng
• Li, Guowen
• Li, Lin
• Li, Ping
• Li, Yang
• Li, Ying
• Li, Yuwen
• Liang, Ling
• Liang, Yanjie
• Liang, Yi Hui
• Libaque-Saenz, Christian
• Lim, Ming K.
• Lin, Chinho
• Lin, Danping
• Liu, Chih-Chung
• Liu, Guoquan
• Liu, Linlin
• Liu, Ou
• Liu, Qinming
• Liu, Xuefeng
• Liu, Yang
• Liu, Zhongzhi
• Llorens Montes, Francisco Javier
• Lo, Jian-Ming
• Loh, Xiu Ming
• Loke, Siew-Phaik
• Looi, Evelyn (Suk Yi)
• Loro, Camillo
• Lu, Qiang
• Luo, Chuan
• Luqman, Adeel
• Lyu, Hongbo
• Ma, Haicheng
• Ma, Hoi Lam
• Ma, Hongguang
• Ma, Li
• Ma, Teng
• Ma, Yiwei
• Ma, Zhuang
• Mao, Lihong
• Maqueira, Juan Manuel
• Martins, Roberto
• Masood, Tariq
• Masuda, Hisashi
• Mathan Kumar, B.
• Matli, Walter
• Matusiewicz, Maria
• Méndez-Suárez, Mariano
• Merhi, Mohammad
• Miguéis, Vera
• Monacis, Lucia
• Mostafiz, Md Imtiaz
• Mou, Jian
• Mu, Wenxin
• Mutum, Dilip
• Nandi, Santosh
• Ng, Poh Kiat
• Nguyen, Truong Van
• Nikbin, Davoud
• Nilashi, Mehrbakhsh
• Nyuur, Richard
• Ooi, Keng-Boon
• Oon, Elaine Yen Nee
• Osei-Frimpong, Kofi
• Oztanriseven, Furkan
• Pahlevansharif , Saeed
• Paliszkiewicz, Joanna
• Pan, Shenle
• Park, Hyun Jung
• Park, Hyunsun
• Pavlidou, Ioanna
• Pei San, Lo
• Peng, Yi
• Phusavat, Kongkiti
• Pu, Xiaodie
• Qian, Cheng
• Qian, Lixian
• Qin, Wei
• Quayson, Matthew
• Queiroz, Maciel
• Ramesh, S.
• Rakiman, Umol Syamsyul
• Rao Hill, Sally
• Ray, Arghya
• Roemer, Ellen
• Routroy, Srikanta
• Ryu, Hyun-Sun
• Sahu, Atul
• Samvedi, Avinash
• Scarlat, Cezar
• Sehnem, Simone
• Sgarbossa, Fabio
• Shan, Wei
• Sharma, Ravi
• Sharma, Rohit
• Sheng, Jie
• Shiau, Wen-Lung
• Shin, Seunghun
• Shou, Yongyi
• Sibona, Christopher
• Simpson, Mike
• Smith, Alan
• Snihur, Yuliya
• Söderlund, Magnus
• Sohal, Amrik
• Sohn, Kwonsang
• Sohrabinejad, Azadeh
• Solakivi, Tomi
• Sreedharan V., Raja
• Srivastava, Praveen Ranjan
• Suh, Woojong
• Sun, Jiasen
• Sun, Yongqiang
• Syed, Asif Ali
• Talwar, Shalini
• Tan Wei Han, Garry
• Tan, Albert
• Tan, Bing Qing
• Tan, Boon In
• Tan, Felix
• Tan, Garry Wei-Han
• Tan, Runhua
• Tan, Teck Ming
• Tandon, Anushree
• Tang, Huajun
• Tang, Yun-Chia
• Tarhini, Abbas
• Tariq, Sidra
• Tchuente, Dieudonne
• Teh, Pei-Lee
• Teng, Ching-I
• Trimi, Silvana
• Troshani, Indrit
• Tsang, Y. P.
• Tse, Ying Kei
• Tseng, Ming-Lang
• Twinomurinzi, Hossana
• Van De Wetering, Rogier
• Vila-Lopez, Natalia
• Vos, Frederik
• Wang, Chao
• Wang, Chen
• Wang, Chong
• Wang, Dafei
• Wang, Jian-Jun
• Wang, Kai
• Wang, Le
• Wang, Liuan
• Wang, May
• Wang, Miao
• Wang, Qiang
• Wang, Qianwen
• Wang, Shan
• Wang, Shouhong
• Wang, Wei
• Wang, Xiaojun
• Wang, Yibo
• Wang, Youying
• Wang, Yuyan
• Wang, Zhiqiang
• Wei, Lihong
• Wei, Shaobo
• Wen, Xin
• Wong, Siew Fan
• Wu, Anbing
• Wu, C. H.
• Wu, Guo-Ciang
• Wu, Ji
• Wu, Lin
• Wu, Wann-Yih
• Wu, Wei
• Wu, Xiaohe
• Wu, Yi
• Xie, Jiaping
• Xiong, Bingqing
• Xu, Gangyan
• Xu, Li Da
• Xu, Lu
• Xu, Xiaofeng
• Xun, Jiyao
• Yan, Ai Hua
• Yan, Bo
• Yan, Chang-Ming
• Yang, Jie
• Yang, Sung-Byung
• Yang, Xiangcheng
• Yang, Xue
• Yee, Rachel W. Y.
• Yeoh, William
• Yin, Jinmei
• Yin, Yaping
• Yu, Joanne
• Yu, Mengli
• Yu, Wantao
• Yuan, Ruizhi
• Zamani, Efpraxia
• Zhan, Yuanzhu
• Zhang, Abraham
• Zhang, Jing
• Zhang, Jingjing
• Zhang, Minhao
• Zhang, Shuzhu
• Zhang, Ting
• Zhang, Wei
• Zhao, Xin
• Zhao, Zhiheng
• Zheng, Bowen
• Zheng, Qi
• Zheng, Shiying
• Zheng, Shuning
• Zhou, Haibo
• Zhou, Li
• Zhou, Li
• Zhou, Paul
• Zhou, Steven
• Zhou, Wangyue
• Zhou, Yun
• Zhou, Yusheng
• Zhou, Zhongyun
• Zhu, Dong Hong
• Zhu, Wenlong
• Zhu, Zujun