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:

• Abdelli, Mohammed El Amne
• Abdesamed, Khalid
• Abreu, António
• Adekiya , Adewale A. 
• Adel Rastkhiz, Seyedeh Elahe
• Afonso Alves, Catarina
• Afrifa, Godfred
• Afriyie, Samuel
• Ahadi, Sahar
• Ahmad, Norwan
• Ahmad, Shabir
• Ahmed, Umair
• Ajiboye, Babatunde
• Akcay, Ediz
• Al Shishany, Amer 
• Al-Tekreeti, Tabarek
• Albuquerque, Fábio
• Aldieri, Luigi
• Ambe, Emmanuel
• Anlesinya, Alex
• Annamalah, Sanmugam
• Aparicio, Sebastian
• Azizi, Mohammad
• Badulescu, Daniel
• Bakr, Sahar
• Bandera, Cesar
• Barreto, Sergio
• Beckinsale, Martin
• Ben Slimane, Sonia
• Bennett, Andrew
• Besson, Ekaterina
• Bewaji, Tolulope
• Bharti, Nisha
• Bogatyreva, Karina
• Bongini, Paola
• Bonoza, Andrew
• Boonsiritomachai, Waranpong
• Bouwman, Harry
• Brännback, Malin
• Brem, Alexander
• Briozzo, Anahi
• Britzelmaier, Bernd
• Broccardo, Laura
• Brzozowski, Jan
• Burgess, Jacqueline
• Burnard, Kevin
• C, Minimol
• Calisto, Maria De Lurdes
• Campo, Raffaele
• Canet-Giner, Teresa 
• Cano Olivos, Patricia
• Cantu, Chiara Luisa
• Cardoni, Andrea
• Cardoso-Castro, Pedro Pablo
• Castillo, Julen
• Charoensukmongkol, Peerayuth
• Chebii, Pamela
• Choudhury, Maumita
• Choudhury, Parthapratim 
• Cochran, Sara
• Costa, Maria Teresa
• Costa, Silvia
• Cox, Andrew
• Cricelli, Livio 
• Cunningham, James
• Dana, Leo Paul
• Dasilva, Amandio
• Dawa, Samuel
• Dell'era, Claudio
• Dermol, Valerij 
• Donbesuur, Francis
• Doria, Mario
• Durst, Susanne 
• Dvouletý, Ondřej
• Dwyer, Rocky
• El Tarabishy, Ayman
• Entrialgo, Montserrat
• Erdélyi, Péter
• Esho, Ebes
• Farha, Yasser
• Fatima , Tehreem 
• Fernandes , Silvia  
• Ferreira, Joao J.
• Ferry, Natalie
• Fisch, Christian
• Flanagan, David
• Floris, Michela
• Fonseca, Maria 
• Forte, Rosa
• Franco, Mário
• Freathy, Paul
• Freixanet, Joan
• Frølund, Claus
• Fronzetti Colladon, Andrea
• Galloway, Laura
• Galloway, Tera
• Gandja , Serge Valant 
• Gërguri, Shkumbin
• Giraldez , Pilar 
• Gomes Santana Félix, Elisabete
• Gomes, Carlos F.
• Goyal, Sandeep
• Gozali, Lina
• Gregori, Patrick
• Haddar, Houneida
• Haddoud, Mohamed Yacine
• Hafeez, Muhammad Haroon
• Haji Gholam Saryazdi, Ali
• Hamdan, Allam
• Han, I
• Harimaya, Kozo
• Harris, Joseph
• Hassi, Abderrahman
• Hazudin , Siti Fahazarina 
• Heinonen, Jarna
• Hodgkinson, Gerard P.
• Holienka, Marian 
• Hunter, Lise
• Ielasi, Federica
• Iliopoulos, Constantine 
• Imarhiagbe, Bernard
• Jabeen, Fauzia
• Jackson, Keith
• Jaim, Jasmine
• Jardon, Carlos M.
• Jeffrey , Scott 
• Jiao, Yongbing
• Jones, Paul
• Joslyn, Jacqueline
• Kalra, Geet
• Kelliher, Felicity
• Keshav, Arun
• Kraus, Patrick
• Kruse, Philipp
• Kumar, Mohit
• Kummitha, Rama
• Kutzewski, Tobias
• La Rocca, Maurizio
• Lancaster, Geoff
• Le, Long
• Leong, Kelvin
• Liguori, Eric
• Lim, Seng Chee
• Liu, Heng 
• Liu, Tianxiang
• Lourenço, Fernando
• Maas, Gideon
• Madichie, Nnamdi
• Magnier-Watanabe, Remy
• Mahmood, Samia
• Maiti, Moinak
• Malaquias, Rodrigo
• Malebana, Mmakgabo
• Mankavil Kovil Veettil, Nandakumar
• Markowska, Magdalena
• Masroor, Imtiaz
• Masurel, Enno
• Mathews , Shane
• Matsumoto, Kohei
• Mayanja, Samuel
• Mensah, Mavis
• Messeni , Antonio  
• Miles, Morgan
• Minatogawa, Vinicius
• Mirchandani, Anita
• Mishra, Ramakanta
• Mitchelmore, Siwan
• Mitra, Arup
• Mohammed, Ibrahim
• Mohapatra, Sanjay
• Monticelli, Jefferson
• Montresor, Sandro
• Muldoon, Jeffrey
• Mulloth, Balashankar
• Munhoz Vieira Franco, Matheus
• Murithi, William
• Mursitama, Tirta N.
• Mustafa, Michael James
• Mwiya, Bruce
• Nair, Jessy
• Naqshbandi, M. Muzamil
• Nasiri, Mina
• Nazri, Mohammad 
• Ndofirepi, Takawira
• Neumeyer, Xaver
• Nieri, Laura
• Nikou, Shahrokh
• Noble, David 
• Nouri, Pouria
• Nyame-Asiamah, Frank
• Nyello, Riziki
• O'dwyer, Michele
• Omeke, Michael
• Onay, Ceylan
• Osowska, Renata 
• Owens, Jonathan
• Owusu-Agyei, Samuel
• Paas, Leo
• Padachi, Kesseven
• Paliwal, Surabhi
• Parsa, H.G.
• Pathak, Saurav
• Paul, Stuart
• Pedrazzoli, Alessia
• Pedroso, Elsa
• Pepin, Matthias
• Pickernell, David
• Pillai, Tharuma Rajan
• Poblete, Carlos
• Pratono, Aluisius
• Quansah, Emmanuel
• Radicic, Dragana
• Rahmadani, Indira
• Raible, Stephanie
• Ramadani, Veland
• Ramadas, Thekkoote
• Rashid, Amber
• Reddy, K.S.
• Rialp, Josep
• Riviere , Monica 
• Rodrigues, Ana C.
• Rodrigues, Lucia Lima
• Rodrigues, Ricardo
• Rodriguez-Cohard, Juan C.
• Rodriguez-Rad, Carlos
• Romano , Mauro 
• Römer-Paakkanen, Tarja
• Romero-García, Leticia
• Roper, Stephen 
• Roundy, Philip
• Roushan, Gelareh
• Sadriwala, Kaneez
• Salamzadeh, Aidin
• Samagaio, Antonio
• Samuels, Richard 
• Sánchez-Marín, Gregorio
• Sanchez-Ruiz, Paul
• Santos, Susana
• Santulli, Rosalia
• Sarfraz, Muddassar
• Schena, Cristiana Maria
• Segaro , Ethiopia L. 
• Sejjaaka, Samuel
• Seville, Martine
• Shahzad, Arfan
• Shemi , Alice Ps
• Singh , Harsh
• Sinkovics, Rudolf
• Solesvik, Marina
• Solomon, Shelby
• Sproul, Curtis
• Standaert, Thomas
• Stephens, Simon
• Stewart, Heather
• Stojčić , Nebojša 
• Sultan, Parves
• T., Ramayah
• Tahtinen, Jaana
• Tarafder, Tasmiha
• Theriou, Georgios
• Thompson, Piers
• Ting, Ding Hooi
• Toschi , Laura 
• Trigo, Virgínia
• Trigos, Federico
• Truant, Elisa
• Ullah, Rehan Ullah
• Vanacker , Tom
• Vanevenhoven, Caroline
• Virtanen, Henrik
• Wang, Xiaofeng
• Wang, Yao
• Yagüe, Agustin
• Yosef, Fathi
• Yuan, Wenlong 
• Zang, Wenyu
• Zhang, Xi
• Zhou, Steven