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:

Abbas, Mohammed
Abdul-Cader, Khwaja
Abu-Rumman, Ayman
abualoush, shadi
Abubakar, A. Mohammed
Achlison, Unang
Acosta-Prado, Julio César
Agrawal, Nishant
Ahamed, AFM Jalal
Ajmal, Mian
Akeroyd, John
Al Hakim, Shidiq
Al Hawamdeh, Nayel
Al-Busaidi, Kamla Ali
Al-dmour, Ahmed
Al-dmour, Hani
Al-dmour, Rand
Al-Hattami, Hamood Mohammed
Al-Mamary, Yaser Hasan
Al-Okaily, Aws
Al-Okaily, Manaf
Alghail, Adnan
Ali, Radwan
Ali, Syed Muhammad 
Aljawarneh, Nader Mohammad
Alshar'e, Marwan
Alstete, Jeffrey
Ampong , George 
Anand, Amitabh
Anthony Jnr, Bokolo
Araújo , Virgínia
Arivalagan, Sengottuvel
Asad, Muhammad Mujtaba 
Ayanbode, Oluyemi  Folorunso
babaie-kafaki, saman
Bahar, Nurhidayah
Bajgoric, Nijaz
Balle, Andrea
Basu, Dr. Bhaskar
Bchir, Azza
Bedford, Denise
Bentaleb, Lamiae
Berjes, Jony 
Bharti, Kumkum
Bindra, Sunali
Bonamigo, Andrei
Brozovic, Danilo
Bruns, Guido
Buhagiar, Kristina
Butt, Atif
Cabrilo, Sladjana
Cannavacciuolo, Lorella
Ch, Vidyadhari
Chaabouni, Amel
Chedid, Marcello
Cheng, Eric
Chenji, Kalaa
Cheong, Ricky
Chigada, Joel
Chisita, Collence
Chong, Chin Wei
Choudhary, Suman
Cricelli, Livio
Csepregi, Anikó
D, Menaga
Dahiyat, Samer
Dalle, Juhriyansyah
Darade, Santosh Ashokrao
De Sarkar, Tanmay
Dietze, Martin
Dneprovskaya, Natalia
Domínguez Romero, Elena
Durst, Susanne
Edvardsson, Ingi
Edwards, John
Elhegazy, Hosam
Elidjen, Elidjen
Erickson, G. Scott
Eze, Uchenna Cyril
Farooq, Rayees
Fathi, Mohammad Reza
Fatima, Dr. Tehreem
Fauzi, Muhammad Ashraf
Ferenhof, Helio
Fischer, Caroline
Freeburg, Darin
Freeman, Mark
Frogeri, Rodrigo
Fu, Jing
Gantasala, Prabhakar
Gerstlberger, Wolfgang
Ghasemi, Behzad
Ghorbanzadeh, Davood
Giraldo, Lillyana
Giuliani, Marco
Goswami, Anil
Gunasekera, Vipula
Haag, Markus
Hammoda, Basel
Harb, Yousra
Hayat, Naeem
Hossain, Md
Hosseini, Mahdi
Huang, Fang
Hussain, Saddam
Ishak, Nurul Amirah
Islam, Talat
Issac, Abraham Cyril
Jibbar, Hashim
Jin, Jian
Kaba, Abdoulaye
Katuu, Shadrack
Keshavarz, Hamid
Khan, Muhammad 
Kragulj, Florian
Ku Bahador, Ku Maisurah
Kumar, Amit
Kumar, Sanjay
Lachachi, Abdelheq
Larocca, Arthur
Le, Phong
Lee, Chien-Sing
Lee, Chien-Sing
Leonard, Karen
M, Neethu
Malik, Shehla
Masa'deh, Ra'ed
Matošková, Jana
Md Kassim, Normalini
Meher, Jamini
Menkhoff, Thomas
Mishra, Rohita
Mohamed, Mona
Monteiro, Samuel
Morales López, Valentino
Mukhtar, Umer
Naidoo, Sugandren
Najar, Tharwa
Nawaz, Nishad
Nguyen, Tuyet-Mai
Nieto Bernal, Wilson
Ojo, Adedapo
Okyere-Kwakye, Eugene
Oliveira, Márcio José Sol
Pangil, Faizuniah
Payal, Ruchi
Pevkur, Aive
Pietrzak, Piotr
Pillai K, Rajasekharan
Pun, Kit Fai
Punia, Devendra
Rahman, Muhammad
Ramakrishnan, Kalaimagal
Rehman, Saqib
Reinhold, Karin
Ribiere, Vincent
Richardson, Brian
Roknuzzaman, Md.
Sahibzada, Umar
Saleh, Mohammed
Scarso, Enrico
Shang, Yanyan
Shimray, Somipam
Shujahat, Muhammad 
Sumbal, Muhammad Saleem
T., Ramayah
Tang, Yinshan
Tayal, Ritu
Temel, Serdal
Thalmann, Stefan
Thullen, Eve
Umar, Muhammad
Upadhyay, Rajesh Kumar
Usmani, Sania
Viegas, Claudia
Walsh, John
Zaid, Ahmed
Zieba, Malgorzata