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: 

Abikova, Jana
Alem, Douglas
Alikhani, Reza
Altay, Nezih
Anaya-Arenas, Ana Maria
Anderson, Renata
Bag, Surajit
Baharmand, Hossein
Banomyong, Ruth
Bansal, Ankit
Bardhan, Amit
Başak, Melek
Behl, Abhishek
Bhawna, Priya
Blansjaar, Martijn
Brito Jr, Irineu
Caglayan, Nadide
Cao, Cejun
Chandra, Dheeraj
Childerhouse, Paul
Chong, Mario
Comes, Tina
Cook, Robert
Cozzolino, Alessandra
Das, Rubel
De Vries, Harwin
Dean, Matthew
Decouttere, Catherine 
Dong, Chuanwen
El Andaloussi, Zineb
Fazli-Khalaf, Mohamadreza
Finkenstadt, Daniel
Fontainha, Tharcisio
Foropon, Cyril
Frederico, Guilherme
Goncalves, Paulo
Graham, Gary
Gralla, Erica
Guerrero, William
Gurumurthy, Anand
Gutjahr, Walter
Guttieres, Donovan
Hadinoto, Cynthia
Hannibal, Claire
Hansen, Ole
Harpring, Russell
Heaslip, Graham
Heyns, Andries
Ibegbunam, Innocent
Jabbar, Abdul
Jonasson, Jonas
Jones, Eric
Kaneberg, Elvira
Kanfra, Elorm
Kansara, Surendra
Kara, Bahar Y.
Karadağ, Ilker
Kashav, Shashi
Klumpp, Matthias
Kosmas, Vasileios
Kotsi, Telesilla
Kovács, Gyöngyi
Krieger, Morgana
Kulkarni, Sourabh
Kumar, Anil 
Kumar, Anup
Kumar, Dinesh
Kunz, Nathan
Larson, Paul
Linkov, Igor
Machado, Henrique
Maghsoudi, Amin
Mitgang, Elizabeth
Modgil, Sachin
Modgil, Sachin
Mosallaeipour, Sam
Moshtari, Mohammad
Mutebi, Henry
Polater, Abdussamet
Pottel, Steffen
Prasanna Venkatesan, Sabari
Queiroz, Maciel
Ramirez-Rios , Diana
Ranjbari, Meisam
Rodríguez-Espíndola, Oscar
Ruesch, Lea
Salman, F. Sibel
Sánchez Gil, Juan
Schiffling, Sarah
Sengul Orgut, Irem
Shah, Bhavin
Sharma, Prayas
Singh, Rohit
Soares Da Silva Júnior, Orivalde
Sohn, Minchul
Soni, Gunjan
Stumpf, Jonas
Tabaklar, Tunca
Torabi, Ali
Transchel, Sandra
Udenio, Maximiliano
Vargas-Florez, Jorge
Varma, Soumya
Villa, Sebastián
Wakolbinger, Tina
Wankmüller, Christian
Warrier, Uma
Yagci Sokat, Kezban
Yan, Qifeng
Yoshizaki, Hugo
Zhang, Jianghua
Zuravleva, Anna