High-quality academic publishing is built on rigorous peer review. Challenges was able to uphold its high standards for published papers due to the outstanding efforts of our reviewers. Thanks to the efforts of our reviewers in 2022, the median time to first decision was 38 days and the median time to publication was 65.5 days. Regardless of whether the articles they examined were ultimately published, the editors would like to express their appreciation and thank the following reviewers for the time and dedication that they have shown Challenges:
| Adedeji Adekunle | Kwok Shing Thomas Wong |
| Alberto Gómez-Mármol | Kyriaki Noussia |
| Aleksandra Gawel | Lei Shi |
| Alessandro Feola | Leonardo Pagani |
| Alexey Sarapultsev | Ligita Baležentienė |
| Alexis S. Benos | Lourdes Vital-López |
| Amy M. Masnick | Maciej Serowaniec |
| Ana Cláudia Coelho | Magdalena Raczyńska |
| Anabela Mesquita | Maggie Beiting-Parrish |
| Andrea Conti | Mamoru Kusaka |
| Andrea Salustri | Marco Dettori |
| Andrés Barrios-Rubio | Margarete Steiner |
| Andreu Comas-Garcia | Margarida Quina |
| Andrzej Piosik | Maria Järlström |
| Andung Bayu Sekaranom | Maria José Quina Galdino |
| Angelina Freeman | Maria Rosaria Varì |
| Anna Parziale | Marina Kostić |
| Anne Balkema-Buschmann | Marino Vilović |
| Annika Lübbert | Mário Tomé |
| Arif Khan | Mark Nelson |
| Artan Hoxha | Mark Watson |
| Aterah Nusrat | Michał T. Tomczak |
| Bettina Mahlert | Mitchell B. Sally |
| Biljana Balen | Mojtaba Kaviani |
| Bogdan Andrei Dumitrescu | Monica Giancotti |
| Carol Nash | Muhammad Asaduzzaman |
| Carolina Marín Martín | Mukesh Kumar |
| Casey Watters | Mukesh Verma |
| Catalina Soriana Sitnikov | Mulazim Hussain Asim |
| Chiara Oppi | Nada Marić |
| Chinedu O. Egwu | Nicolae Gica |
| Ching-Yeh Tsai | Nor Norazlin Kamal |
| Chris Paci | Nyamongo Onkoba |
| Christoph Woiwode | Ofelia Anjos |
| Christopher R. D’Adamo | Pablo Fernández-Arias |
| Christos Chrysoulas | Paige M. Hulls |
| Cong Ou | Paul Dieppe |
| Danuta Umiastowska | Paul Forsythe |
| Denise Starkey | Paulo Reis Mourão |
| Dominika Dzwonkowska | Pawel Ziemianski |
| Duo Dickinson | Phillip A. Alviola |
| Dušan Ž. Mijin | Piotr Poznański |
| Edyta Pasicka | Radoslaw Rybkowski |
| Eleonora Genovese | Rahim Abdur |
| Emilia Herman | Raja Rajendra Timilsina |
| Emőke-Szidónia Feder | Ralph M. J. Schielen |
| Esther Lázaro | Ricardo Bolado-Lavín |
| Fabio Matos Chiarelli | Richard McCuen |
| Fabrizio Desideri | Robert Richter |
| Filip Dohnal | Rodica Ianole-Calin |
| Filipe Paiva-Santos | Rui Bertuzi |
| Funmi (Olufunmilola) Ojediran | Rungtai Lin |
| Fuwen Zhao | Ryuichi Ohta |
| George Valiakos | Saif Ur Rehman |
| German Perez | Sanjib Saha |
| Gianfranco Natale | Sankarprasad Bhuniya |
| Gillian Eastwood | Santosh Kumar |
| Giulia Iacobucci | Sara Gil Rodríguez |
| Giuseppe Pisaturo | Sara L. Warber |
| Grigorios L. Kyriakopoulos | Sheng Zhang |
| Grzegorz Ignatowski | Stephanie Steels |
| Guido Macchiarelli | Stephen Bagwell |
| Hermann Gilly | Stephen M. Popkin |
| Hideaki Ohgaki | Sunil S. Karhadkar |
| Hiranya Sritart | Svanborg Rannveig Jónsdóttir |
| Hoichi Amano | Takuya Tada |
| Hongwu Jing | Tamzin Furtado |
| Howard Matis | Timothy Sly |
| Hoyeon Shi | Tomasz Gigol |
| Humberto Javier Rodríguez Hernández | Ulrich Kreidenweis |
| Ilaria Sammarra | Valerie A. Matarese |
| Irina Gostin | Vasiliki Vrana |
| Jacopo Sgrignani | Veikko Ikonen |
| Jean-Marie Exbrayat | Veronica Coram |
| Jennifer Cole | Virtudes Pérez-Jover |
| Jesus Saiz Galdos | Vito Bobek |
| Jihye Shin | Vitor Francisco Ferreira |
| Jill Anderson | Vladimir Dodevski |
| Jo Bjorgaard | Vladimír Hula |
| Joanna Pietrzak-Zawadka | Volker Harth |
| João Miguel Xavier Rita | Wilfried Zörner |
| John Butler | William Stephen Morton |
| José L. Martinho | Wojciech Hanke |
| Joy Francis | Yan-Bin Huang |
| Juan David Rodas | Yaron Finzi |
| Kang Hao Cheong | Yeongbae Choe |
| Karen M. Kedrowski | Youness El Bakri |
| Karthikeyan Venkatachalam | Zbigniew Popek |
| Katarzyna Wolny-Koładka | Zoltan Baracskai |
| Keru Lu |
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