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:

• Abdel-Azim, Mohamed
• Abdel-Kader, Magdy
• Abdelfattah, Tarek
• Abdoush, Tony
• Abdul Wahab, Nor Shaipah
• Abdullah, Yasir
• Abhayawansa, Subhash
• Abobakr, Mohamed
• Aboud, Ahmed
• Achouche, Mohamed
• Adelopo, Ismail
• Adhikari, Pawan
• Adwan, Sami
• Agathee, Ushad Subadar
• Agyei-Boapeah, Henry
• Agyei-Boapeh, Henry
• Ahmad, Wasim
• Ahmadi, Ali
• Ahmed, Ahmed
• Ahmed, Ahmed Hassan
• Ahmed, Alim Al Ayub
• Ahmed, Ammad
• Ahmed, Kamran
• Ahmed, Md Shoaib
• Ahmed, Rizwan
• Al-Shaer, Habiba
• Alam, Md. Saiful
• Alarussi, Ali
• Alawattage, Chandana
• Albawwat, Ibrahim
• Albu, Nadia
• Alexander, David
• Alhossini, Mohammed
• Ali, Asgar
• Ali, Muhammad
• Alshehabi, Ahmad
• Ambalangodage, Dayananda
• Arun, Thankom
• Ashraf, Junaid
• Azure, John
• Baboukardos, Diogenis
• Bananuka, Juma
• Bansal, Manish
• Bartocci, Luca
• Bhuiyan, Md. Borhan
• Boateng, Agyenim
• Bose, Sudipta
• Bourmistrov, Anatoli
• Broberg, Pernilla
• Brusca, Isabel
• Bufarwa, Idris
• Burton, Bruce
• Castelo Branco, Manuel
• Chakroun, Raïda
• Charteris, Ailie
• Chatziaras , Antonios
• Coffie, William
• Cohen, Sandra
• Dayanandan, Ajit
• Denedo, Mercy
• Devi, Susela
• Diab, Ahmed
• Diekman, Peter
• Dimes, Ruth
• Dixon, Keith
• Drogalas, George
• Du Toit, Elda
• Dzolkarnaini, Nazam
• Egbon, Osamuyimen
• Ehalaiye, Dimu
• El-Helaly, Moataz
• Elsalkh, Mohamed
• Elshandidy, Tamer
• Ezeani, Ernest
• Farag, Hisham
• Flynn, Antoinette
• Frezatti, Fabio
• Gao, Lei
• Ghattas, Peter
• Golyagina, Alena
• Gossel, Sean
• Grey, Colette
• Grossi, Guiseppe
• Gull, Ammar Ali
• Guven, Pinar
• Haque, Faizul
• Harun, Harun
• Hashim, Hafiza Aishah
• Haslam, Jim
• Heiling, Jens
• Hein, Nelson
• Hiebl, Martin
• Holland, Kevin
• Hopper, Trevor
• Houqe, Nurul
• Hussainey, Khaled
• Hussein, Saad
• Hussinki, Henri
• Ibrahim, Awad Elsayed
• Ibrahim, Masud
• Ishaque, Maria
• Islam, Shahidul
• Jack, Lisa Janet
• Jayasinghe, Kelum
• Jory, S. R.
• Kaawaase, Twaha
• Kalyvas , Antonis
• Khan, Arifur
• Khan, Yasir
• Khan, Tehmina
• Khuong, Nguyen Vinh
• Kimani, Danson
• Kirimi, Peter
• Kirkpatrick, Alan
• Krambia-Kapardis, Maria
• Kwabi, Frank
• Kwakye, Teddy Ossei
• Ladas, Anestis
• Lan, Hao
• Lassou, Philippe
• Lassoued, Naima
• Lee, Wee Meng Eric
• Legard, Sveinung
• Leventis, Stergios
• Li, Jing
• Li, Pngli
• Liu, Huilong
• Liu, Jiangtao
• Lu, Yun
• Machokoto, Michael
• Macve, Richard
• Mahmood, Zeeshan
• Malagila, John
• Malikov, Kamran
• Manawadu, Isuru
• Mathuva, David
• Matuszak, Łukasz
• Md Zaini, Syeliya
• Mei, Lee
• Mihret, Dessalegn
• Miranda-Lopez, Jose
• Mnif Sellami, Yosra
• Mohammadi, Syeeda Shafiya
• Mollik, Abu
• Moses, Olayinka
• Muhamad Sori, Zulkarnain
• Mutiganda, Jean Claude
• Mzenzi, Siasa
• Nagirikandalage, Padmi
• Nahar, Hairul
• Nelson, Sherliza Puat
• Nguyen, Lan Anh
• Nguyen, Tam
• Nguyen, Thi
• Nimtrakoon, Sirinuch
• Nkundabanyanga, Stephen
• Nnadi, Matthias
• Noronha, Carlos
• Northcott, Deryl
• Nowland, John
• Ntim, Collins
• Oberholzer, Merwe
• Oboh, Collins
• Oliveira, Jonas
• Othman, Hakim
• Othman, Radiah
• Otusanya, Olatunde
• Ou Lyu, Ou
• Owusu, Charles
• Ozili, Peterson
• Padachi, Kesseven
• Papanastasopoulos, George
• Perotti, Pietro
• Petera, Petr
• Pianezzi, Daniela
• Pirveli, Erekle
• Platanakis, Emmanouil
• Polzer, Tobias
• Popesko, Boris
• Porporato, Marcela
• Ramdhony, Dinesh
• Ratri, Melinda
• Różańska, Ewa
• Ruopiao, Zhang
• Salama, Aly
• Salem, Rami
• Sarhan, Ahmed
• Seetharam, Yudhvir
• Sena, Vania
• Sena, Vania
• Senkl, Daniela
• Shahab, Yasir
• Shahadat, Khandakar
• Shailer, Greg
• Sharma, Umesh
• Siagian, Ferdinand
• Siddiqui, Javed
• Sobhan, Abdus
• Sorour, Karim
• Stainbank, Lesley
• Steenkamp, Gretha
• Sumiyana, Sumiyana
• Sun, Hanwen
• Tallaki, Mouhcine
• Teeroovengadum, Viraiyan
• Tijani, Bashir
• Tingbani, Ishmael
• Tiwari, Ranjit
• Toscano, David
• Tripathy, Amit
• Trucco, Sara
• Tunyi, Abongeh
• Uddin, Hamid
• Uddin, Mohammed Mohi
• Ullah, Subhan
• Upadhaya, Bedanand
• Van Helden, Jan
• Vitoria, Patsika
• Wachira, Mumbi
• Wagner, Jaroslav
• Wan Mohammad, Wan Masliza
• Wanderley, Cláudio
• Wang, Peng
• Wang, Yan
• Waweru, Nelson
• Wickramasinghe, Danture
• Wijethilake, Chaminda
• Win, Sandar
• Wynne, Andy
• Xu, Xiaolu
• Yates, David
• Yekini, Kemi
• Yekini, Liafisu Sina
• Zalata, Alaa
• Zaman, Mahbub
• Zhang, Aoran
• Zhang, Dengjun
• Zhang, Junru
• Zhang, Xin
• Zhang, Zhifang