Rigorous peer-review is the corner-stone of high-quality academic publishing. The editorial team greatly appreciates the reviewers who contributed their knowledge and expertise to the journal’s editorial process over the past 12 months. In 2019, a total of 99 papers were published in the journal, with a median time to first decision of 19 days and a median time to publication of 51 days. The editors would like to express their sincere gratitude to the following reviewers for their cooperation and dedication in 2019:
| Abdalrahman, Ahmed | Ilieva, Iliana | Panchal, Satyam |
| Abdollahi, Ali | Ilinčić, Petar | Park, Jin-Soo |
| Adebisi, Bamidele | Iluk, Artur | Peng, Ming-Tsan |
| Ahmed, Qadeer | Ioakimidis, Christos | Pernía, Alberto M. |
| Ainalis, Daniel | Ishihara, Keiichi N. | Pfriem, Matthias |
| Almadhor, Ahmad | Jabbari, Faryar | Pham, Thinh |
| Al-Saadi, Mohammed | Jafari, Soheil | Philipsen, Ralf |
| Alskaif, Tarek | Jason, Ede | Piórkowski, Piotr |
| Amini, M. Hadi | Jiang, Zhe | Piotr, Piórkowski |
| Amini, M. Hadi | Jochem, Patrick | Pop-Calimanu, Ioana Monica |
| Anagnostopoulou, Afroditi | Jochem, Patrick | Portelinha, Francisco Manuel |
| Andersen, Jens Christian | Jung, Sunghun | Prakht, Vladimir |
| Augusto, Andres | Kampker, Achim | Radac, Mircea-Bogdan |
| Aziz, Muhammad | Karnavas, Yannis | Radac, Mircea-Bogdan |
| Bai, Xianxu | Kasnatscheew, Johannes | Ramon, Peral Orts |
| Balázs, Horváth | Katić, Vladimir | Rassõlkin, Anton |
| Ballantyne, Erica E.F. | Kelleher, Luke | Rathod, Dhruvang |
| Banerjee, Bibaswan | Kendra, Martin | Ren, Xiaoyong |
| Bardizza, Giorgio | Kester, Johannes | Rettig, Rasmus |
| Barukcic, Marinko | Khanra, Munmun | Reuter-Oppermann, Melanie |
| Basabe, Edorta Ibarra | Kim, Kwang Sik | Rhi, Seok-Ho |
| Basbas, Socrates | Kim, Namdoo | Riba, Jordi-Roger |
| Bi, Zicheng | Knez, Matjaž | Ricciardi, Vincenzo |
| Bizon, Nicu | Knežević, Goran | Rivera, Sebastian |
| Blanqué Molina, Balduino | Ko, Young Dae | Rizzo, Denise M. |
| Borcherding, Anke | Kontou, Eleftheria | Robledo, Carla B. |
| Börner, Markus | Kooijman, J. D. G. | Rohan, Ali |
| Borruso, Giuseppe | Koulocheris, Dimitrios | Rousseau, Aymeric |
| Bozalakov, Dimitar | Kriston, Akos | Savard, Christophe |
| Brandão, Alexandre | Kroičs, Kaspars | Schratter, Markus |
| Brendel, Alfred Benedikt | Kyriakidis, Miltos | Schwenzel, Julian |
| Brown, Matthew | Larson, Paul D. | Sedikki, Lynda |
| Bucaioni, Alessio | Lazarou, Stavros | Serpi, Alessandro |
| Buzna, Lubos | Lazzeroni, Paolo | Shaheen, Susan |
| Campo, Celeste | Lei, Jiaxing | Shao, Xinxin |
| Cao, Mengqiu | Lemke, Justyna | Shao, Yunli |
| Carreras-Sospedra, Marc | Leonowicz, Zbigniew | Shekhar, Aditya |
| Cavaco Mendes, Mário José Gonçalves | Leou, Rong-Ceng | Shepherd, Simon |
| Cernat, Mihai | Lhomme, Walter | Shousha, Mahmoud |
| Chatzikyriakou, Despoina | Li, Bo | Simunovic, Srdjan |
| Chen, Yan | Li, Haocheng | Skrucany, Tomas |
| Chen, Yuxiao | Li, Xianglin | Skugor, Branimir |
| Chung, Kuan-Jung | Liang, Jianyong | Solyali, Davut |
| Clairand, Jean-Michel | Liao, Fanchao | Spanoudakis, Polychronis |
| Cohen, Adam | Licitra, Gaetano | Stopka, Ondrej |
| Cousineau, Emily | Ligen, Yorick | Sun, Qun |
| Crebier, Jean-Christophe | Lin, Chun-Liang | Sun, Wei |
| Cullen, Genevieve | Lin, Jeng-Chyan Muti | Taefi, Tessa T. |
| Czermański, Ernest | Liu, Chunhua | Taghia, Javad |
| Damacharla, Praveen | Liu, Haiou | Tahami, Hoda |
| D'Amato, Egidio | Liu, Jiechao | Tajiri, Kazuya |
| Danielis, Romeo | Liu, Teng | Tal, Gil |
| De Cauwer, Cedric | Liu, Tyng | Talukdar, Saurav |
| De Cauwer, Cedric | Liu, Yujing | Tamor, Michael A. |
| Deaconu, Sorin Ioan | Liudvinavičius, Lionginas | Teichert, Olaf |
| Del Pero, Francesco | Ližbetin, Ján | Trigui, Rochdi |
| Dizo, Jan | Lotfy, M.E. | Trimboli, Scott |
| Dong, Jianning | Lu, Fei | Tsai, Chi-Yi |
| Dorneles Callegaro, Alan | Luttenberger, Lidija Runko | Tudoroiu, Nicolae |
| Eberle, Ulrich | Lv, Chen | Ustun, Taha Selim |
| Eguchi, Kei | Lv, Nengchao | Van Den Bossche, Alex |
| Elrajoubi, Akrem Mohamed | Ma, Tai-Yu | Van Den Bossche, Peter |
| Erickson, Larry | Ma, Yue | Verzosa, Nina |
| Fellendorf, Martin | Maigha, Maigha | Vilca, José |
| FELSEGHI, Raluca - Andreea | Mandrioli, Riccardo | Vorraro, Giovanni |
| Fernandez, Efren | Mangano, Giulio | Wang, Jinghui |
| Ferreira, Joao | Mansor, Mohd Radzi Abu | Wang, Luting |
| Ferreira, Joao C. | Marra, Dario | Wang, Ning |
| Friedman, Keith | Martinez De Alegria, Inigo | Winkelbauer, Martin |
| Fu, Xingang | Marzbani, Hormoz | Winstead, Vincent |
| Fulton, Lew | Matusiewicz, Maria | Wolbertus, Rick |
| Gajic, Dragoljub | Mehmood, Khawaja Khalid | Wolfgang, Bernhart |
| Gao, Feng | Mehmood, Khawaja Khalid | Wolfram, Paul |
| Gavrilas, Mihai | Meschede, Henning | Wu, Fan |
| Geng, Bo | Miao, Yu | Wu, Xiaogang |
| Ghanaatian Jobzari, Mohammad | Mingant, Remy | Xie, Shaobo |
| Gheorghe, Grigoras | Minnaert, Ben | Xu, Meng |
| Giansoldati, Marco | Mocera, Francesco | Yahya, Bernardo Nugroho |
| Goli, Preetham | Moradisizkoohi, HADI | Yang, Cheng-Jung |
| Graber, Giuseppe | Morita, Kenji | Yang, Lei |
| Graham, Robert | Morsalin, Sayidul | Yang, Li |
| Groot, Jens | Motoaki, Yutaka | Yang, Shichun |
| Guo, Hongqiang | Mouli, Gautham Ram Chandra | Yang, Xiaoyun |
| Hafez, Omar | Müller, Alexander | Yu, Yuanbin |
| Hafiz, Faeza | Munkácsy, András | Zapata, Jaime W. |
| Hamada, Kimimori | Nagarajan, Magesh | Zhai, Li |
| Hannula, Ilkka | Nascimento, Micael | Zhang, Aron |
| Harries, David | Nguyen, Xuan Bac | Zhang, Cong |
| Helber, Stefan | Obayashi, Shuichi | Zhang, Jiangyan |
| Herrera Perez, Victor Isaac | Obrecht, Matevz | Zhang, Lei |
| Herrera, Omar E | Oda, Takuya | Zhang, Lijun |
| Hillmansen, S. | Omori, Hideki | Zhang, Qi |
| Hinov, Nikolay | Ongel, Aybike | Zhang, Ronghui |
| Hoshi, Nobukazu | Orosz, Tamás | Zhang, Weige |
| Hoyos Velasco, Fredy | Ortenzi, Fernando | Zhang, Yongming |
| Hu, Chuan | Ota, Ryosuke | Zhang, Yun |
| Hu, Jianjun | Ou, Shiqi | Zhao, Zhenli |
| Hu, Xiaosong | Pai, Kai Jen | Zheng, Huarong |
| Hu, Yong | Pallonetto, Fabiano | Zhou, Bin |
| Huang, Xuzhen | Pallonetto, Fabiano | Zhou, Kan |
| Huang, Yanjun | Paluszczyszyn, Daniel | Zhou, Zhibin |
| Hughes, Larry | Pan, Shuai | Živanović, Predrag |
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