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:

• Abokyi, Eric
• Abraham, Ayobamiji Awosusi
• Abul Kashem, Mohammad
• Adebayo, Tomiwa
• Aghbashlo, Mortaza
• Ahmed, Waqas
• Ahoa, Emmanuel
• Ali, Sharafat
• Ali, Syed Mithun
• Almontaser, Tariq
• Alola, Andrew
• Alvarado, Rafael
• Amos, Daniel
• An, Qingxian
• Andreoni, Valeria
• Ang, Sheng
• Antoh, Ernestina Fredua
• Anwar, Awais
• Aryal, Mahendra
• Assi, Ala
• Atuoye, Kilian Nasung
• Awad, Abdel Hameed
• Awodumi, Olabanji
• Bag, Surajit
• Bai, Kaixuan
• Baležentis, Tomas
• Balsalobre-Lorente, Daniel
• Barthwal, Sunil
• Baumgarte, Felix
• Bekun, Festus
• Benhanifia, Khatir
• Bhadoria, Robin Singh
• Bhatt, Priyanka
• Bhutta, M. Khurrum
• Bouraiou, Ahmed
• Braga, Vitor
• Bui, Tat-Dat
• Chai, Jinxia
• Chen, Jun
• Chen, Lin
• Chen, Mingxing
• Chen, Xueli
• Chen, Zhongbing
• Ching, Suet Ling
• Choong, Yuen-Onn
• Chowdhury, Priyabrata
• Chu, Junfei
• Chuang, Li-Min
• Cicea, Claudiu
• Cliff, Rochlin
• Cristóbal, Jorge
• Crncevic, Tijana
• Cuamba, Boaventura
• Cui, Lixin
• Dangi, Neeraj
• Danish, Danish
• De Miranda, Renato Billia
• Dian Wisika Prajanti, Sucihatiningsih
• Dong, Kangyin
• Du, Juntao
• Du, Zhili
• Dubey, Rameshwar
• Dybiec, Jacob M.
• Elahi, Ehsan
• Errami, Youssef
• Evaggelinos, Konstantinos
• Farrukh, Muhammad
• Farzipoor Saen, Reza
• Fernandes, Cristina
• Ferronato, Giulia
• Figueiredo, Ronnie
• Galetic, Fran
• Gecevska, Valentina
• Gedikli, Ayfer
• Gelbmann , Ulrike
• Gelegenis, John
• Ghazali, Ihwan
• Giuliano, Aristide
• Giwa, Solomon
• Gomes, Carlos F.
• Grdic, Zvonimira Sverko
• Guesmi, Bouali
• Hafeez, Muhammad
• Haider, Salman
• Haini, Hazwan
• Haldorai, Kavitha
• Halkos, George
• Hayat, Khizar
• Herath Bandara, Saman
• Hiremath, Siddalingayya G.
• Hsu, Jane
• Huang, Xiangjun
• Idowu, Olayinka
• Imran, Muhammad
• Isa, Siti
• Jaaron, Ayham
• Jabarzadeh, Younis
• Jain, Prerna
• Jain, Vineet
• Jaiswal, Anand
• Jakhar, Suresh Kumar
• Jiang, Qibo
• Jiang, Wei
• Jing, Xuening
• Jugend, Daniel
• Juhadi, Juhadi
• Kanji, Repaul
• Karasoy, Alper
• Karttunen, Elina
• Keränen, Outi
• Ketin, Sonja
• Khan, Afzal Husain
• Khan, Muhammnad Kaleem
• Khan, Ramsha
• Khan, Syed Abdul Rehman
• Khataee, Alireza
• Khodaverdi, Roohollah
• Kifayat Shah, Sayed
• Komulainen, Hanna
• Korkut Pata, Ugur
• Kowalewski, Zbigniew
• Kozlowska, Barbara
• Krauss, Judith E.
• Kumar Mahalik, Mantu
• Kumar, Anish
• Kumar, Satish
• Kumari, Neha
• Landi, Daniele
• Ledda, Antonio
• Li, Dandan
• Li, Guoxiang
• Li, Qianwen
• Li, Ranran
• Li, Tianxiang
• Li, Wenbo
• Liang, Rong-D
• Liddle, Brantley
• Lim, Ming
• Liobikienė, Genovaitė
• Liu, Xiaowei
• Liu, Yu
• Liu, Yuan
• Liu, Zheming
• Lobo, Carla
• López Gamero, María D.
• Lovren, Violeta
• Luo, Ruisen
• Luttenberger, Lidija Runko
• Ma, Ben
• Ma, Xiaowei
• Makhdum, Muhammad Sohail Amjad
• Malik, Muhammad
• Mariyono, Joko
• Marques, Carla Susana
• Marrucci, Luca
• Martinez-Valencia, Lina
• Marwan, Nur Fakhzan
• Memisoglu, Tugba
• Mensah, Justice
• Miceikienė, Astrida
• Milazzo, Mariafrancesca
• Moghimi, Mostafa
• Mohanty, Mahamaya
• Mohd-Sabrun, Ibrahim
• Mubarak, Muhammad
• Murshed, Muntasir
• Nadeem, Muhammad
• Nandi, Santosh
• Nayak, Bishwajit
• Nègre, Emmanuelle
• Nunoo, Edward
• Ofori, Daniel
• Oliveira, Márcio
• Onanuga, Olaronke
• Onubi, Hilary
• Orisakwe, Orish Ebere
• Oryani, Bahareh
• Oteng-Abayie, Eric Fosu
• Paes, Luis Alberto Bertolucci
• Pan, Xiongfeng
• Pincheira, Roxana
• Rafindadi, Abdulkadir Abdulrashid
• Rahman, Shahriar
• Rakos, Ileana–Sorina
• Ramadani, Veland
• Rana, Md Masud Parves
• Reyneke, Mignon
• Rocca, Laura
• Rodríguez Algeciras, José Abel
• Rokita-Poskart, Diana
• Rong, Wang
• Rounaghi, Mohammad Mahdi
• Sadiq, Mohd
• Sagnak, Muhittin
• Sahu, Naresh Chandra
• Salustri, Francesco
• Santibañez, Gabriela
• Sardianou, Eleni
• Sarwar, Suleman
• Schultz, Felix Carl
• Settembre Blundo, Davide
• Sghaier, Asma
• Shah, Bhavin
• Shaharudin, Mohd Rizaimy
• Shan, Yuli
• Shang, Yuping
• Shao, Anqi
• Sharifi, Mohammad
• Sharma, Abhishek
• Sharma, Manu
• Sharma, Nitika
• Sharma, Rajesh
• Shobande, Olatunji Abdul
• Shukla, Saurabh
• Siddiquei, Ahmad
• Silva, Jorge
• Silva, Wesley Douglas
• Singh, Ajit Pratap
• Singh, Poonam
• Singh, Rajesh
• Singh, Sumer
• Singh, Surya Prakash
• Sinha, Avik
• Skouloudis, Antonis
• Spadafore, Brittany
• Spanos, Konstantinos
• Spânu, Simona
• Suh, Jungho
• Sujanto, Raditia
• Sultan, Muhammad
• Sun, Jing
• Sundarakani, Balan
• Sunnapwar, Vivek
• Swarnapali, Rmnc
• Tan, Qinliang
• Taspinar, Nigar
• Thakker, Shivangi
• Thakur, Vikas
• Tomporowski, Andrzej
• Tran Dinh, My Thanh
• Trentinaglia, Maria Teresa
• Tseng, Ming Lang
• Tursoy, Turgut
• Udokporo, Chinonso Kenneth
• Ulucak, Recep
• Upadhyay, Arvind
• Upadhyay, Parijat
• Usman, Muhammad
• Valero-Gil, Jesus
• Varma Mundakkara Kovilakam, Ravi
• Vasiraja, N.
• Velazquez, Luis
• Vella, Joseph
• Vihari, Nitin Simha
• Vineeshiya, Nimali
• Waheed, Abdul
• Wang, Chun-Yang
• Wang, Jason X.
• Wang, Jiangquan
• Wang, Qiang
• Wang, Rongbo
• Wang, Shanyong
• Wang, Shuhong
• Wang, Songkai
• Wang, Tao
• Wei, Chooi-Yi
• Wilson, Matthew
• Xie, Qianjiao
• Yang, Mian
• Yasmeen, Humaira
• Yau, Yung
• Yin, Jinmei
• Yusliza, Mohd-Yusoff
• Zafar, Muhammad Wasif
• Zhang, Bo
• Zhang, Jiaen
• Zhang, Qingjun
• Zhang, Shuai
• Zhang, Xinxin
• Zhang, Yunlong
• Zhao, Pengfei
• Zhao, Xin
• Zhou, Li
• Zhou, Yuanxiang
• Zhou, Zhixiang
• 刘, 燚爽
• 程, 秀
• 郑, 欢玉