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:
| Ab Rahman, Asmak |
| Abd. Aziz, Hassanuddeen |
| Abdel Moshin, Magda |
| Abdeldayem, Marwan |
| Abdullah, Md. Faruk |
| Ahmad, Azlin Alisa |
| Akhtaruzzaman , Md Akhtaruzzaman |
| Al-Malkawi, Husam-Aldin |
| Al-shami, Samer |
| Ali, Muhammad Aqib |
| Ali, Searat |
| Almasarwah, Adel |
| Alotaibi, Khaled |
| Ameer, Rashid |
| Arshad, Shaista |
| Asif, Rabia |
| Asmy, Mohamed |
| Ayaz, Mohammad |
| Azmi, Wajahat |
| Azouzi, Dhekra |
| Azrak, Tawfik |
| Bansal, Rohit |
| Behringer, Stefan |
| Bhatti, Ishaq |
| Bilel, Hadfi |
| Bowden, James |
| Burton, Bruce |
| Calandra, Davide |
| Chandra, Abhijeet |
| Chandra, Deep |
| Chong, Felicia Hui Ling |
| Choudhury, Tonmoy |
| Creta, Fabio |
| Cull, Michelle |
| Dalei, Narendra |
| Damayanti, Krisna |
| Dhochak, Monika |
| Ducceschi, Luca |
| Eachempati, Prajwal |
| Elias, Rafik |
| Evrim Mandaci, Pınar |
| Ferreira, Sune |
| Forbes, William |
| Garg, Neha |
| Gigante, Gimede |
| Graziano, Anna |
| Gunasekarage, Abeyratna |
| Hamdan, Nur Hazirah |
| Hamid, Syaiful Rizal |
| Hanif, Muhammad |
| Higson, Andrew |
| Hossain, Shahadat |
| Ibekwe, Ibeawuchi |
| Ishak, Muhammad Shahrul Ifwat |
| Jain, Ankit |
| Kamal, Javed |
| Kamarudin, Fakarudin |
| Kamarudin, Mohd Khairy |
| Kammoun, Manel |
| Kan, Yoke Yue |
| Kandpal, Vinay |
| kar , Arpan |
| khaki, Muhammad |
| Khalid, Umair |
| Khan, Imran |
| Khan, Naimat |
| Khan, Shabeer |
| Kuanova, Laura |
| Kumar, Dr. Prashant |
| Kumar, Satish |
| Kwansa, Nana Abena |
| Kyiu, Anthony |
| Lai, Ming-Ming |
| Löher, Jonas |
| Ly, Kim |
| Marc Lim, Weng |
| Massironi, Carlo |
| Md Husin, Maizaitulaidawati |
| Md Zabri, Mohd Zaidi |
| Mehta, Pooja |
| Mhlanga, David |
| Mirza, Sultan |
| Mostafa, Mohamed |
| Naik, Pramod Kumar |
| Nanayakkara, Neelangie |
| Nimer, Khalil |
| Nouman, Muhammad |
| O'Keeffe, Cormac |
| Olatubosun, Posi |
| Pandey, Nitesh |
| Paramati, Sudharshan Reddy |
| Patel, Ajay |
| Pattnaik , Debidutta |
| Poufinas, Thomas |
| Power, David |
| Preda, Alexandru |
| Rafiki, Ahmad |
| Rahim, Adeel |
| Rahman, Md Habibur |
| Ramiah, Vikash |
| Rao, Purnima |
| Rasul, Tareq Faizur |
| Rehman, Seema |
| Rostami, Vahab |
| Rounaghi, Mohammad Mahdi |
| Roy, Ankur |
| Saeudy, Mohamed |
| Saha, Kunal |
| Saini, Neha |
| Sakti, Muhammad Rizky Prima |
| Salin, Ahmad Saiful Azlin Puteh |
| Saliya, Candauda Arachchige |
| Saraswat, Gopal |
| Seal, Jayanta Kumar |
| Shah, Farooq |
| Sharma, Gagan |
| Sharma, Prashant |
| Singh, Simarjeet |
| Singh, Yogita |
| Sulong, Jasni |
| Sureka, Riya |
| Tabash, Mosab |
| Taglialatela, Jonathan |
| Tahat, Yasean |
| Tareq, Mohammad |
| Tarim, Emre |
| Thas Thaker, Hassanudin Mohd |
| Tomar, Swrta |
| Tripathi, Abhinava |
| Tunyi, Abongeh |
| Tuyon, Jasman |
| Wagdi, Osama |
| Wang, Yang |
| Wasiuzzaman, Shaista |
| Wickremasinghe, Guneratne |