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 |