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:
| Abbott, Larry |
| Abdelrazik, Donia |
| Abdul Wahab, Effiezal Aswadi |
| Abdulkarim, mustafa |
| Abernathy, John |
| Abidi, Qambar |
| Aboelsoud, Mostafa |
| Aboud, Ahmed |
| Acito, Andrew |
| Adrian, Christofer |
| Afzali, Haroon |
| Ahmi, Aidi |
| Akers, Michael |
| Al-Dhaafri, Hassan |
| Al-Okaily, Jihad |
| Al-Qadasi, Adel |
| Alam, Pervaiz |
| Aldamen, Husam |
| Alexander, Deborah |
| Alharasis, Esraa |
| Ali, Rizwan |
| Ali, Shahid |
| Alves, Joaquim |
| Amin, Ali |
| Amin, Hala |
| Amin, Keval |
| Anderson, Urotn |
| Argiles, Josep Maria |
| Asdemir, Ozer |
| Asiaei, Kaveh |
| Atif, Muhammad |
| Austin, Ashley |
| Awadallah, Emad |
| Ayedi, Soumaya |
| Azad, Abdollah |
| Baatwah, Saeed |
| Bae, Gil |
| Bakarich, Kathleen |
| Balla, Vassiliki |
| Bamahros, Hasan Mohamad |
| Bansal, Avijit |
| Bansal, Avijit |
| Bao, Dichu |
| Barr-Pulliam, Dereck |
| Barrainkua, Itsaso |
| Basuony, Mohamed |
| Berglund, Nathan |
| Bhandari, Avishek |
| Bose, Sudipta |
| Boskou, Georgia |
| Botha, Lise |
| Bowlin, Kendall |
| Brasel, Kelsey |
| Bravo, Francisco |
| Brennan, Niamh M. |
| Browne, Amber |
| Bryan, David |
| Bujaki, Merridee |
| Buslepp, William |
| Campa, Domenico |
| Can, Gökberk |
| Cao, Yiting |
| Chan, Hung |
| Chand, Parmod |
| Chang, Millie |
| Chen, Feng |
| Chen, Yi Chun |
| Chen, Ying |
| Chiu, She-Chih |
| Chiu, Tiffany |
| Cho, Moon-Kyung |
| Choi, Jong-Hag |
| Choi, Seung Uk |
| Christ, Margaret |
| Chu, Mui Kim |
| Compernolle, Tiphaine |
| Convery, Amanda |
| Cui, Lidong |
| Cullinan, Charles |
| Curtis, Mary |
| D'Onza, Giuseppe |
| Dahawy, Khaled |
| Dao, Mai |
| Davis, Larry |
| Dayanandan, Ajit |
| Dayyala, Niharika |
| Desai, Naman |
| Diab, Ahmed |
| Donnelly, Amy |
| Donnelly, Raymond |
| Draeger, Michelle |
| Du, Ruixue |
| El-Halaby, Sherif |
| El-helaly, Moataz |
| El-Helaly, Moataz |
| Elbardan, Hany |
| Elnahas, Marwa |
| Elshandidy, Tamer |
| Epelbaum, Nicolas |
| Erasmus, Lourens |
| Espinosa-Pike, Marcela |
| Eulerich, Marc |
| Fanning, Kirsten |
| Farag, Magdy |
| Fernando, Guy |
| Fogarty, Timothy |
| Fontaine, Rich |
| Fortin, Anne |
| Foster, Ben |
| Frost, Tracie |
| Fu, Dale |
| Garcia-Blandon, Josep |
| Gauthier, Marion |
| Golden, Joanna |
| Gong, James |
| Greenman, Cindy |
| Gul, Ferdi |
| Guo, Feng |
| Gutierrez, Elizabeth |
| Gyapong, Ernest |
| Habib, Ahsan |
| Hall, Curtis |
| Han, Lei |
| Hao, Maggie |
| Hassan, Abeer |
| Hassan, Nasr |
| Hassan, Omaima |
| Hassan, Yousef |
| Hassanein, Ahmed |
| Hay, David |
| He, Wen |
| He, Yue |
| Hegazy, Karim |
| Hegazy, Mohamed |
| Hesarzadeh, Reza |
| Hetrick, Kamber |
| Hickman, Leila Emily |
| Ho, Yew Kee |
| Hoffman, Benjamin |
| Hsiao, Chih-Jen |
| Huang, Feiqi |
| Hwang, Induck |
| Islam, Ainul |
| Jackson, Andrew |
| Järvinen, Tuukka |
| Kalelkar, Rachana |
| Kamal, Sama |
| Kamareldawla, Noha |
| Kamel, Hany |
| Kannan, Yezen |
| Karim, Sitara |
| Kariya, Ankitkumar |
| Kend, Michael |
| Kent, Pamela |
| Kent, Pamela |
| Khan, Arifur |
| Khan, Safraz |
| Khan, Tehmina |
| Khemakhem, Hanen |
| Khoo, Eunice |
| Kim, Bum Joon |
| Kim, Yewon |
| Kitiwong, Weerapong |
| Köhler, Annette |
| Komal, Bushra |
| Kumas, Abdullah |
| Kuntluru, Sudershan |
| Kuo, Li-Chun |
| Laksmana, Indrarini |
| Landry, Suzanne |
| Lau, David |
| Law, Daniel |
| Lawson, Bradley |
| Lee, Gladys |
| Lee, Hua |
| Lee, Kyung Yun |
| Lei, Lijun |
| Lento, Camillo |
| Lim, Youngdeok |
| Lin, Yu-Chun |
| Litt, Barri |
| Liu, Jiaxin |
| Liu, Min |
| Liu, Ming |
| Liu, Mingzhi |
| Liu, Zenghui |
| Loh, Lawrence |
| Loh, Ricci |
| Lombardi, Danielle |
| Lou, Rixing |
| Lu, Hung-Yuan (Richard) |
| Lu, Wei |
| Lu, Yingfa |
| Luo, Xin |
| Lutz, Stefan |
| Lynch, Edward |
| Lyubimov, Alexey |
| Ma, Hayley |
| Maghakyan, Arpine |
| Magnan, Michel |
| Mak, Yuen Teen |
| Mejia-Likosova, Margarita |
| Michael, Amir |
| Millar, Melanie |
| Mnif, Yosra |
| Mohd Sanusi, Zuraidah |
| Mostafa, Diana |
| Naciti, Valeria |
| Nagy, Albert |
| Nehme, Rabih |
| Neidermeyer, Presha |
| Ng, Terence |
| Nguyen, Lan Anh |
| Nie, Dongfang |
| Norihiro, Nishimura |
| Obendorf, Giselle |
| Ocak, Murat |
| Ogunade, Kehinde |
| Omer, Waddah |
| Oussii, Ahmed |
| Pajunen, Kati |
| Park, Soo Yeon |
| Park, Sorah |
| Parker, Robert |
| Peltier, Elisabeth |
| Popova, Velina |
| Purohit, Siddharth |
| Qu, Tracy Xin |
| Raghunandan, Kannan |
| Rashid, Afzalur |
| Rautiainen, Antti |
| Rickett, Laura |
| Rimkus, Dan |
| Ruhnke, Klaus |
| Rusmita, Sylva |
| Saastamoinen, Jani |
| Saleh , Ahmed |
| Salehi, Mahdi |
| Salleh, Zalailah |
| Samaha, Khaled |
| Sargent, Carol |
| Saunders, K Kelli |
| Scarparo, Simona |
| Schmidt, Martin |
| Schneider, Arnold |
| Seavey, Scott |
| Seufert, Juergen |
| Shamsul Nahar, Abdullah |
| Sharma, Divesh |
| Sirois, Louis-Phillippe |
| Sivadasan, Padmakumar |
| Smith, Jason |
| Smith, Kenneth |
| Son, Myungsoo |
| sra, Jaspreet |
| Steyn, Blanche |
| Stice, Derrald |
| Suh, Ikseon |
| Sun, Jerry |
| Sun, Kevin |
| Svanström, Tobias |
| T. F. Abuhijleh, Sara |
| Taylor, Stephen |
| Teng, Zhong-Lu |
| Thor, Timmy |
| Tian, Li |
| Tian, Xiaoli |
| Ting-Chiao, Joey |
| Tripathy, Arindam |
| Tsakumis, George |
| Usman, Muhammad |
| Vakilzadeh, Hamid |
| Vasarhelyi, Miklos |
| Vousinas, Georgios |
| Wan Hussin, Wan Nordin |
| Wang, Jundong |
| Wang, Ke |
| Wang, Peng |
| Wang, Sophia |
| Wang, Suye |
| Waweru, Nelson |
| Wen, Wen |
| Wheatley, Clark |
| Wilson, Mark |
| Wood, David |
| Wynn, Jinyoung |
| Xie, Jun |
| Xu, Hongkang |
| Xu, Liang |
| Yang, Daoguang |
| Yang, David |
| Ying, Qianwei |
| Young, Randall |
| Yu, Jaeyoon |
| Yuri, Sadoi |
| Zaid, Mohammad |
| Zaidan, Hala |
| Zalata, Alaa |
| Zhang, Eliza |
| Zhang, Janus |
| Zhang, Jian |
| Zhang, Lipai |
| Zhang, Mengyu |
| Zhang, Wenjun |
| Zhang, Yaqing |
| Zhao, Yijiang |
| Zhou, Gaoguang |
| Zhou, Yaou |
| Zhu, Xindong |
| Zimmerman, Aleksandra |