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:
| A, Saju |
| Abbad, Muneer |
| Afolabi, Adekunle |
| Agyabeng-Mensah, Yaw |
| Ahmad, Ibrahim |
| Ahmad, Nor Azizah |
| Ahmad, Rabiah |
| Al-Mamari, qasim |
| Aldarazi, Abduallah |
| Aljaroodi, Hussain M. |
| Alsharari, Nizar |
| Alti, Adel |
| Anthony Jnr., Bokolo |
| Aparicio, Manuela |
| Aslanertik, Banu Esra |
| Atkinson, Kirk |
| Bai, Bingfeng |
| Bansal, Rohit |
| Bernardo, Giovanni |
| Bhattacharyya, Som Sekhar |
| Bothin, Antje |
| Bouri, Elie |
| Camacho, Sonia |
| Chen, Xiaoyu |
| Chica, Manuel |
| Chong, Yee-Lee |
| Cimpeanu, Theodor |
| Daulatkar, Sonal |
| Deng, Hepu |
| Dhakal, Sandeep |
| Dong, Fangrui |
| Dubey, Rameshwar |
| Effah, John |
| Fan, Zongwen |
| Fathelrahman, Adil |
| Franco, Mário |
| Gleiss, Alexander |
| Grubisic, Igor |
| Guinaliu, Miguel |
| Gupta, Pooja |
| Gurav, Shashidhar B |
| Handarkho, Yonathan Dri |
| Hanifah, Haniruzila |
| Hasan, Najmul |
| Hidalgo-Herrero, Mercedes |
| Hoe, Siu Loon |
| Iman, Nofie |
| Iyamu, Tiko |
| Jauhar, Sunil Kumar |
| K Nguyen, Hung |
| Kaba, Bangaly |
| Keivanian, Farshid |
| Khetwal, Anuradha |
| Klesel, Michael |
| Kolog, Emmanuel Awuni |
| Kuik, Swee |
| Kumar, Ajay |
| Kumar, Rahul |
| Kumar, Vimal |
| Kusumastuti, Ratih Dyah |
| Lin, Mei-Lan |
| Ma, Yiping |
| Mancini, Daniela |
| Manohar, Murali |
| Marquardson, Jim |
| Medeiros, Mauricius |
| Mikhaylov, Alexey |
| Mohamed, Mona |
| Mukherjee, Sourav |
| Munnukka, Juha |
| Mwenje, Tichakunda Rodney |
| Nayak, Bishwajit |
| Olaleye, Sunday |
| Orji, Ifeyinwa |
| Osei-Frimpong, Kofi |
| Reyes-Mercado, Pável |
| Rodríguez, Ismael |
| Rouast, Philipp |
| Satia Budhi, Gregorius |
| Shah, Bhavin |
| Shaikh, Dr. Aijaz A. |
| Sharma, Gajendra |
| Shukla, Monica |
| Tanouri, Afshin |
| Thongsri, Nattaporn |
| Tokdemir, Gül |
| Tukamuhabwa, Benjamin |
| Ukpabi, Dandison |
| Uzir, MD Uzir Hossain |
| Vafaei-Zadeh, Ali |
| Verkijika, Silas Formunyuy |
| Verma, Pratima |
| Wang, Yini |
| Xiao, Min |
| Yu, Tai-Kuei |