Rigorous peer-reviews are the basis of high-quality academic publishing. Thanks to the great efforts of our reviewers, IJTPP 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 21 days and the median time to publication was 72 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:
| Aki Grönman | Mauricio Gutierrez |
| Andrea Cattanei | Mauro Carnevale |
| Andrea Ferrero | Mehrdad Zangeneh |
| Antoine Archer | Michael Henke |
| Antoine Dazin | Michele Ferlauto |
| Antoine Placzek | Michele Greco |
| Antonio Andreini | Michele Marconcini |
| Antti Uusitalo | Miguel Asuaje |
| Aravinth Sadagopan | Mike Barton |
| Bogdan C. Cernat | Mugurel Stanciu |
| Caetano Peng | Narmin Hushmandi |
| Christoph Hassa | Nick Baines |
| Claus Sieverding | Nicola Casari |
| Daniele Pampaloni | Nicolas Binder |
| Daniele Simoni | Nithish Anand |
| Davide Lengani | Oliver Pountney |
| Dingxi Wang | Oluwadamilare Rahman Imam-Lawal |
| Emmanuel Benichou | Oyvind Hundseid |
| Emmanuel Laroche | Pacciani Roberto |
| Erik Dick | Patrick Buchwald |
| Erik Janke | Patrick Sterzinger |
| Fabio Cozzi | Paul Beard |
| Fadi Abdel Nour | Paweł Obstawski |
| Fangyuan Lou | Pengbo Ren |
| Feng Gao | Pieter Groth |
| Filippo Merli | Pietro Zunino |
| Florent Duchaine | Piotr Lampart |
| Francesco Montomoli | Reinhard Niehuis |
| Frank Eulitz | Richard Tunstall |
| Friedrich-Karl Benra | Robert Elliott |
| Gerard Bois | Robin Elder |
| Gerhard Kahl | Rocco Moeretti |
| Gherardo Zambonini | Rodolfo Bontempo |
| Giovanna Barigozzi | Romuald Rzadkowski |
| Giovanna Cavazzini | Ruud Eggels |
| Gwi Bo Byun | Sebastian Schuster |
| Ján Kizek | Sébastien Poncet |
| Jean Decaix | Sergio Lavagnoli |
| Jérôme Boudet | Shahrokh Shahpar |
| Joachim Belz | Shailendra Naik |
| Johan Dahlqvist | Silvia Ravelli |
| Kevin Britchford | Simon Pramstrahler |
| Klaus Semmler | Simone Salvadori |
| Koen Hillewaert | Sina Stapelfeldt |
| Laurent Gicquel | Sławomir Kubacki |
| Lorenzo Pinelli | Soheil Jafari |
| Loris Simonassi | Stefan Berten |
| Mahmoud A. Khader | Stefano Rebay |
| Manuel Henner | Stefano Valvano |
| Marcus Meyer | Stéphane Aubert |
| María Vera-Morales | Taddei Simone Rosa |
| Markus Jöcker | Tadeusz Chmielniak |
| Markus Schatz | Teemu Turunen-Saaresti |
| Martin Böhle | Terrence Simon |
| Martin Buisson | Thomas Carolus |
| Martina Ricci | Vladimir Kindra |
| Mathias Steger | Xiaofeng Sun |
| Matthias Schuff |
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