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:

• A, Prasanth
• A, Prasanth
• A., Moorthy
• Aarabi, Mokhtar
• Abdul Hamid, Zuratul Ain
• Abdul Rahim, Herlina
• Abdulkhaev, Oybek
• Abdullah, Fairuz
• Abu Znaid, Ammar
• Abu-Baker, Amjad
• Abu-Khalaf, Jumana
• Agoston, Katalin
• Aguir, Khalifa
• Ahmad, Fauzan
• Alboul, Lyuba
• Ali, Zeshan
• Ang, Qian Yee
• Aram, Siamak
• Areias, Isac
• Atkeson, Christopher G.
• Avanaki, Kamran
• Aydin, Muhammet
• Bahrani, Sonia
• Bai, Xiangzhi
• Bai, Yanping
• Barhoumi, Houcine 
• Bayer, Ilker S. 
• Beiu, Roxana-Mariana
• Bensaid, Samir
• Berlina, Anna
• Bhatnagar , PK 
• Billingsley, John
• Bin Ibrahim, Sallehuddin
• Bobrinetskiy, Ivan
• Brajovic, Ljiljana
• Brajović, Ljiljana
• Branzila, Marius
• Burghardt, Andrzej
• Callejas-Cuervo, Mauro
• Camerini, Cesar
• Cao, Huiliang
• Cao, Lidan
• Carotenuto, Riccardo
• Chandrasekaran, Srimathi
• Chang, Qingbing
• Chatterjee, Rajdeep
• Chavali, Murthy 
• Chen, Chiachung
• Chen, Haiyan
• Chen, Hua
• Chen, Meng
• Chen, Xueye
• Cheng, Yuhua
• Choudhary, Dilip
• Chrostowski, Piotr
• Chu, Fenghong
• Ciuonzo, Domenico
• Crenna, Francesco
• D'emilia, Giulio
• Datta, Manali
• De La Calleja, Jorge
• Demrozi, Florenc
• Di Claudio, Elio
• Diao, Quan
• Ding, Jiong
• Dos Santos, Fernando
• El-Khozondar, Hala
• Evangelista, Daniele
• FALEH, Rabeb
• Fang, Gu
• Fazalul Rahiman, Mohd Hafiz
• Feng, Lihang
• Fink, Richard
• Foroughi, Mohammad Mehdi
• Foster, M. J.
• Gaol, Ford
• Gaur, Mulayam
• Géczy, Attila
• Giannoccaro, Nicola Ivan 
• Giannopoulos, Georgios
• Gong, Hai
• Guo, Yongxing
• Guzel, Mehmet
• Hakim, Noorkholis Luthfil
• Hayber, Şekip Esat
• He, Xiangming
• Hegde, Kanthi
• Hernández Callejo, Luis
• Honzátko, David
• Huang, Liangsong
• Huang, Xingbao
• Işık, Murat
• Islam, Dr. Md. Rashedul
• Jackson, David
• Jain, Prince
• Jain, Raj
• Jasim, Wesam
• Jha, Chandan Kumar
• Jia, Pengfei
• Jin, Rencheng
• Jones, Scott B.
• Juengert, Anne
• Justin, Gusphyl
• Kadri, Nahrizul Adib
• Kam, Menderes
• Khenchaf, Ali
• Kim, Sung Min
• Kizilova, Natalya
• Klionovska, Ksenia
• Korbel, Piotr
• Kuzma, Anton
• Lenin, Ashmiya
• Li, Chenggang
• Li, Chong
• Li, Cun
• Li, Xiangyang
• Li, Zhihong
• Liang, Ting
• Lihui, Wang
• Lin, Qijing
• Liu, T.Z.
• Liu, Yan
• Lopes, António
• Loven, Lauri
• Lu, Sheng
• Lu, Yanli
• Łuczak, Sergiusz
• M., Vijay
• Ma, Chengjian
• Martínez, Rogfel Thompson
• Mendonca, Fausto
• Michahial, Stafford
• Mikhaylov, Alexey
• Mondal, Kunal
• Morawski, Roman
• Muravev, Anton
• Mustapha, Samir
• Nadezhdin, Igor
• Nayeri, Maryam
• Nesterenko, Tamara
• Nizam, Tamchek
• Nkundineza, Celestin
• Odziemczyk, Waldemar
• Offermans, Peter
• Okokpujie, Kennedy
• Ortega-Mendoza, Gabriel 
• Peczkowski, Pawel
• Penezić, Abra
• Pérez Alonzo, Abraham
• Petrucha, Vojtěch
• Pothiraj, Sivakumar
• Prasad, Devulapalli Shyam
• Qureshi, Umair Mujtaba
• Rahman, Asifur
• Rajamanickam, Yuvaraj
• Randhawa, Princy
• Rane, Sunit
• Ranjan, Pinku
• Ray, Partha Pratim
• Ren, Zongjin
• Sabra, Adham
• Saffell, John
• Saini, Preeti
• Sakhabutdinov, Airat
• Sampath, Santhakumar
• Sapozhnikova, Kseniia
• Sbarufatti, Claudio
• Sedlák, Petr
• Shi, Yonghua
• Skibicki, Jacek
• Soman, Rohan
• Song, Kechen
• Sterzyński, Tomasz
• Szwagierczak, Dorota
• Tan, Yuegang
• Tedetti, Marc
• Teng, Chuanxin
• Tian, Guiyun
• Toxqui-Quitl, Carina 
• Tůma, Petr
• Uchaikin, Sergey
• Ukil, Arijit
• Van Schepdael, Ann 
• Venkatrao, Patil Hanmant 
• Visentin, Francesco
• Wang, Hairong
• Webb, James
• Wojciechowski, Krzysztof
• Wrbanek, John D.
• Wu, Rujun
• Wu, Wei
• Xu, Min
• Yang, Weibo
• Zapico, Pablo
• Zarrabi, Ferdows
• Zet, Cristian
• Zhang, Chunwei
• Zhang, Dongzhi
• Zhang, Guangcheng
• Zhang, Jun
• Zhang, Meng
• Zhang, Weike
• Zhang, Xiao-Liang
• Zhao, Xiaofeng
• Zhao, Yanzhi
• Zhou, Congcong
• Zoriasatain, Susan