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:
| Alharbi, Rayan |
| ALobaid, Abdullah |
| Althunayyan, Saqer |
| Armstrong, Stephanie |
| Asgary, Ali |
| Backteman, Susann |
| Ball, Stephen |
| Bazyar, Jafar |
| Behl, Abhishek |
| Berlin, Johan |
| Blaney, Leigh |
| Bosley, Christopher |
| Brewin, Chris |
| Butterworth, Lesley |
| Caliskan, Cuneyt |
| Callanan, Ian |
| Carlström, Eric |
| Ceklic, Ellen |
| Chang, Ray |
| Chilton, Kenneth |
| Clarke , Vin |
| Clarke, Julian |
| Coltey, Erik |
| Daovisan, Hanvedes |
| Darmawan, Rony |
| Deham, Magdalena |
| DelGrosso, Bill |
| Denham, Magdalena |
| Deschênes, Andrée-Ann |
| Dikkatwar, Ramkrishna |
| Dillern, Thomas |
| Dwyer, Rocky J |
| Edwards, Derrick |
| Elliott, Ian |
| Grace, Lita |
| Harrington, Rosalyn |
| Haux, Sarah |
| Haynes, Steven |
| Humann, Michael |
| Hunter, Justin |
| Huntsman, David |
| Huntsman, David |
| Jayasekara, Prasadi |
| Joshi, Sudhanshu |
| Karvela, Panagiota |
| Katseas, Vaios |
| Keene, Toby |
| Kelshall, Candyce |
| Kern, Hannes |
| Khan, Vikram |
| Kim, Kyungwoo |
| Klockner, Karen |
| Lestari, Fatma |
| Li, Dale |
| Loveday, Barry |
| Lundberg, Lars |
| Ma, Tingguang |
| Magnussen, Leif Inge |
| Maher, Karen |
| Makkink, Andrew |
| Makrides, Timothy |
| Mavhura, Emmanuel |
| McAleavy, Tony |
| McCann, Sharon |
| Miller, Anastasia |
| Mohd Tohir, Mohd Zahirasri |
| Monteiro Fonseca, Sílvia |
| Montgomery, Roy |
| Mulyono, Nur Budi |
| Naser, Alireza |
| Negi, Saurav |
| Ng, Wai Chung James |
| Okita, Yosuke |
| Okunola, Olasunkanmi |
| Osei, Hannah Vivian |
| Oteir, Alaa |
| Owusu Kwateng, Kwame |
| Perrott, Stephen |
| Phillips, Pete |
| Queirós, Cristina |
| Robertson, Duncan |
| Rodgers, Bryan |
| Rokonuzzaman, Md |
| Runefors, Marcus |
| Safarpour, Hamid |
| Shekhar, Aditya |
| Sienkiewicz-Małyjurek, Katarzyna |
| Simcock, Tom |
| Simmons, Laura |
| Slater, Alan |
| Smith, Todd |
| Sobuwa, Simpiwe |
| Soon, Jan-Jan |
| Sporer, Celia |
| St-Denis, Karine |
| Steel, Craig |
| Stenberg, Rebecca |
| Subramaniam, Chandrakantan |
| Tao, Yudong |
| Taylor, Mark |
| Tharima, Ahmad Faiz |
| Thornton, Richard |
| Tin, Derrick |
| Umesi, Emenike |
| Urbane, Lukas |
| Van Der Net, Wynand |
| Van Roey, Jan |
| Wagner, Shannon |
| Wakeham, Ronald |
| Waring, Sara |
| Waring, Sara |
| Wilson, Caitlin |
| Wolmesjö, Maria |
| Yousefi Zenouz, Reza |