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:
| Abdelfattah, Tarek |
| Abdelghany, Hesham |
| Abdo, Hafez |
| Abdollahi, Ahmad |
| Abdullah, Maizatulakma |
| Abdullatif, Modar |
| Abir, Hichri |
| Aboramadan, Mohammed |
| Abou-El-Sood, Heba |
| Abou-Seada, Magda |
| Aboud, Ahmed |
| Adelopo, Ismail |
| Adesina, Oluseyi |
| Adu-Ameyaw, Emmanuel |
| Agyei-Boapeah, Henry |
| Agyekum, Ataa |
| Ahmed, Ahmed Hassan |
| Aksoy, Mine |
| Al -Shaer, Habiba |
| Al Lawati, Hidaya |
| Al-Gamrh, Bakr |
| Al-Shaer, Habiba |
| Al-Shattarat, Basiem |
| Albitar, Khaldoon |
| Allain, Elodie |
| Allini , Alessandra |
| Almaharmeh, Mohammad |
| Anderson, Warwick |
| Anifowose, Mutalib |
| Annabi, Amira |
| Appiah, Kingsley |
| Ashfaq, Khurram |
| Ashraful Alam, Md |
| Aujirapongpan, Somnuk |
| Awadallah, Emad |
| Ayres, Dourglas |
| Bachiller, Patricia |
| Bance, Philippe |
| Baumüller, Josef |
| Baylis, Richard |
| Ben Farahat Toumi, Nadia |
| Bennouri, Moez |
| Berthelot, Sylvie |
| Binsardi, Ben |
| Bond, David |
| Borgi Fendri, Hela |
| Boshnak, Helmi |
| Botica Redmayne, Nives |
| Boubaker, Sabri |
| Bouteska, Ahmed |
| Brüggemann, Ulf |
| Buchholz, Daniel |
| Caby, Jérôme |
| Caputo, Fabio |
| Castelo Branco, Manuel |
| Cheng, Jin |
| Cheung, Kwok Yip |
| Choi, Ka Wai |
| Chorvat, Elizabeth |
| Chowdhury, Anup |
| Cifalino, Antonella |
| Clarkson, Peter |
| Cohen, Sandra |
| Corazza, Laura |
| D'Silva, Kenneth |
| Daodu, Olabisi |
| Dinis, Ana |
| Dong, Lei |
| Dsouli, Ouarda |
| Edeigba, Jude |
| Eisl, Christoph |
| El Khoury, Rim |
| El Sayed, Nadar |
| El-Gazzar, Samir |
| El-Halaby, Sherif |
| Elamer, Ahmed |
| Elbardan, Hany |
| Eliwa, Yasser |
| Elliot, Viktor |
| Elmarzouky, Mahmoud |
| Fallan, Even |
| Favotto, Alvise |
| Ferentinou, Aikaterini |
| Fernández Laviada, Ana |
| Fiandrino, Simona |
| Fink, Stefan |
| Florio, Cristina |
| Fuhrmann, Stephan |
| G. Harb, Etienne |
| Gastone, Laura-Maria |
| Ginesti, Gianluca |
| Grueb-Martin, Birgit |
| Gyapong, Ernest |
| Gyimah, Daniel |
| Haj Salem, Issal |
| Halabi, Hussein |
| Hamdan, Allam |
| Harrer, Theresia |
| Harris, Elaine |
| Hasan, Fakhrul |
| Hassan, Omaima |
| Hay, David |
| Helliar, Christine |
| Holland, Kevin |
| Hong, Sanghyun |
| Huang, Qinglan |
| Huhtamäki, Fredrik |
| Hussainey, Khaled |
| Ibrahim, Awad |
| Ibrahim, Masud |
| Inegbedion, Henry |
| Issa, Ayman |
| Jahangir Ali, Muhammad |
| Jalan, Akanksha |
| Jastram, Sarah |
| Juma'h, Ahmad |
| Kaab Omeir, Ahmad |
| Kandpal, Vinay |
| Kapaya, George |
| Karmani, Majdi |
| Kassem, Rasha |
| Kettunen, Jaana |
| Khlif, Hichem |
| Kilic, Merve |
| Kissing, Philipp |
| Komakech, Samuel |
| Kordsachia, Othar |
| Kyriacou, Orthodoxia |
| Lauck, John |
| Lehner, Othmar |
| Leopizzi, Rossella |
| Li, Jialong |
| Li, Jing |
| Li, Zhaohua |
| Lin, Long-Sheng |
| Liu, Chelsea |
| Liu, Qing |
| Lombardi, Rosa |
| Lopez Perez, Maria Victoria |
| Luong, Hoa |
| Magerakis, Efstathios |
| Maier, Florentine |
| Majercakova, Daniela |
| Makarem, Naser |
| Malafronte, Irma |
| Malik, Ali |
| Malikov, Kamran |
| Mardini, Ghassan |
| Marton, Jan |
| Masschelein, Stijn |
| Massoudi, Dianne |
| Mather, Paul |
| Mathuva, David |
| Menschl, Elisabeth |
| Mersni, Hounaida |
| Mhedhbi, Karim |
| Michael, Amir |
| Miihkinen, Antti |
| Miras, Maria del Mar |
| Misirlioglu, Ismail |
| Mohd, Akbar |
| Moumen, Nejia |
| Muro, Laura |
| N'Guessan, Kevin |
| Naciti, Valeria |
| Nadeem, Muhammad |
| Nagirikandalage, Padmi |
| Negash, Minga |
| Neokleous, Christina |
| Nguyen, Thi Thu Ha |
| Nicolo', Giuseppe |
| Nnadi, Matthias |
| Oradi, Javad |
| Orelli, Rebecca Levy |
| Ottenstein, Philipp |
| Owen, Robyn |
| Owusu, Andrews |
| Paananen, Mari |
| Paino, Halil |
| Pancholi, Jatin |
| Pathak, Rajesh |
| Peng, Jacob |
| Rahman, Mahfuzur |
| Ren, Mengbing |
| Reuben, Alicja |
| Rudolf, Anna |
| Runesson, Emmeli |
| Saastamoinen, Jani |
| Salehi, Mahdi |
| Samani, Niuosha |
| Sardianou, Eleni |
| Schaberl, Phillipp |
| Shams, Riad |
| Silvola, Hanna |
| Song, Guoxiang |
| Soobaroyen, Teerooven |
| Stötzer, Sandra |
| Sundvik, Dennis |
| Suwanyangyuan, Nattavut |
| Tammen, Thomas |
| Tan, Yiqing |
| Tasiou, Menelaos |
| Thor, Timmy |
| Tiron-Tudor, Adriana |
| Trabelsi, Samir |
| Traxler, Albert Anton |
| Tyson, Thomas |
| Uddin, Moshfique |
| Uyar, Ali |
| Vaittinen, Piia |
| Valentinetti, Diego |
| Valenza, Giuseppe |
| Van der Zahn, Mitchell |
| Van Zanten, Jan Anton |
| Velte, Patrick |
| Veltri, Stefania |
| Venuti, Francesco |
| Viehs, Michael |
| Wagner, Eva |
| Weber, Olaf |
| Weller, Macy |
| Wilson, Aaron |
| Windisch, David |
| Wu, Ji |
| Wu, Kai |
| Yan, Yan |
| Ying, Sammy Xiaoyan |
| Yoon, Hyo Jin |
| Yuen, Desmond |
| Zalata, Alaa |
| Zaman, Mahbub |
| Zampone, Giovanni |
| Zarone, Vincenzo |