Rigorous peer-reviews are the basis of high-quality academic publishing. Thanks to the great efforts of our reviewers, Foundations was able to maintain its standards for the high quality of its published papers. Thanks to the contribution of our reviewers, in 2021, the median time to first decision was 26 days and the median time to publication was 44 days. The editors would like to extend their gratitude and recognition to the following reviewers for their precious time and dedication, regardless of whether the papers they reviewed were finally published:
| Ahmed Adel | Julio M. Hoff Da Silva |
| Ahmed Salem | Koji Nagata |
| Airton Deppman | Liangjie Wong |
| Aleksey V. Nikulov | Luiz Fernando C. De Oliveira |
| Alexander A. Narits | M. Saravanan |
| Alexander Demura | Maik Kschischo |
| Andriy Bandura | Marcus Krüger |
| Boris F. Minaev | Maria Korovina |
| Boris Michailovich Smirnov | Marina Manganaro |
| Briceyda B. Delgado | Marion Johnson |
| Bruno Gomes Da Costa | Mark Reybrouck |
| Chakib Taybi | Massinissa Yahia |
| Changmo Hwang | Michal Ciemala |
| Cheng-Yu Ku | Michelle Liou |
| Dilna Nataliya | Miklós Krész |
| Dramane Pare | Milan S. Dimitrijevic |
| Elisabeth Dalimier | Peeter Saari |
| Fidel Meléndez-Vázquez | Radoslaw Strzalka |
| Francisco Perez | Raúl Quevedo-Blasco |
| Gielen Steffen | Rija Erveš |
| Glenn Ledder | Robert Georges |
| Gordon Drake | Spiros Alexiou |
| Haidong Yuan | Svetlana Bunimovich-Mendrazitsky |
| Harald Schenk | Sylwester Furmaniak |
| Hartmut Traunmüller | Thiago Henrique Napoleão |
| Ilona Kulikovskikh | Tomasz Grzebyk |
| J. E. Solís-Pérez | Vyacheslav Dokuchaev |
| Janos Zsolt Mezei | Yasuhiro Tokura |
| Jean-Christophe Pain | Yu-Feng Li |
| Jerome Petri |
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