Improving and maintaining the standard of papers in this journal depend on the selfless time and effort of the many scientists who review manuscripts. We acknowledge and thank the following individuals for reviewing manuscripts submitted to our journal during 2021; some of them have reviewed more than one manuscript.

Abbas Abbaszadeh Shahri

A Abedini

Emmanuel Addo Jr.

Ryoichiro Agata

Alfredo Alegria

Denis Allard

Omid Aminoroayaie Yamini

Di Crescenzo Antonio

Tatiyana Apanasovich

Daisy Arroyo

Erica Ashe

Sebastian Avalos

Majid Bagheri

Michał Balcerek

Joerg Benndorf

Stefano Berrone

Lin Bi

Jeff Boisvert

Stefano Bondua

Trond Brenna

Alexandre Brouste

Antonella Buccianti

Vladislav Bukshtynov

Sam Butler

Guofeng Cao

Octavio Castillo-Reyes

Guillaume Caumon

Snehamoy Chatterjee

Jui-Sheng Chen

Yongliang Chen

Anna Chiaradonna

Alessandro Comunian

Clay Cooper

Zacche da Silva Camilla

Arash Taleghani Dahi

Saumik Dana

Kshitij Dawar

Sandra De Iaco

Didier Yu Ding

Jo Eidsvik

Kjersti Eikrem

Ahmed Elsheikh

Hamid Emami-Meybodi

Xavier Emery

David Ernst

Rodrigo Exterkoetter

Zulima Fernandez

Francky Fouedjio

Frantisek Gallovic

Stefanos Georganos

Erwan Gloaguen

Richard Gloaguen

Jaime Gómez-Hernández

Ryan Goodfellow

Pierre Goovaerts

Michael Greenacre

Eric Grunsky

Ragnar Hauge

Gerard Heuvelink

Michael Hillier

Sebastian Hoerning

Roland Horne

Amin Hossein Morshedy

Weisheng Hou

Dionissios Hristopulos

Karel Hron

Jeffrey Hyman

Behnam Jafarpour

Ajay Jasra

Josef Jezek

Chuandong Jiang

Richard Ketcham

K.V. Kislov

Vasileios Kitsikoudis

Dmitriy Kolyukhin

Devesh Kumar

Paul La Pointe

Nadege Langet

JaKob Larsen

Etienne Lavoine

Emanuel Lazar

Romain Le Goc

Juliana Leung

Kewen Li

Liangping Li

Zhanglin Li

Ching-Ping Liang

Chae Young Lim

Bin Liu

Chenglin Liu

Mingliang Liu

Shimin Liu

Xiaodong Luo

Rasmus Madsen

Tom Manzocchi

Denis Marcotte

Saeid Mehdizadeh

Alessandra Menafoglio

Nadia Mery

Ilnur Minniakhmetov

Siddharth Misra

Laurent Montesi

Jean-Philippe Montillet

Eugene Morgan

Stephen Mosher

Lukas Mosser

Jacek Mucha

Manfred Mudelsee

Tapan Mukerji

Donald Myers

Alessandro Navarra

Roseanna Neupauer

Ricardo Olea

Julian Ortiz

Mohammad Parsa

Edzer Pebesma

Rodrigo de Lemos Peroni

Sinesio pesco

Luis Petro

Christopher Piecuch

Sandra Pieraccini

Saman Razavi

Alexandra Renouard

Jason Roberts

Per Røe

Behnam Sadeghi

Elena Savelieva

Mohammad Sayyafzadeh

Helmut Schaeben

Stefano Scialò

Mrinal Sen

Katherine Silversides

Harpreet Singh

Jacob Skauvold

Amilcar Soares

Gianluca Sottili

Mohan Srivastava

Satomi Suzuki

Gábor Szatmári

Pejman Tahmasebi

Che Mohd Imran Che Taib

Hassan Talebi

Arash Dahi Taleghani

Raimon Tolosana-Delgado

A.F.B. Tompson

Anita Torabi

Cedric Travelletti

Svenn Tveit

Bora Uçar

Eddie Udegbe

Hayato Ushijima-Mwesigwa

Gerald van den Boogaart

Sophie Viseur

Hai Vo

Florian Wellmann

Xian-Huan Wen

Allan Woodbury

Wei-Ying Wu

Chaoshui Xu

Chicheng Xu

Qinshan Yang

Lingqing Yao

Xiaohui Yuan

Tuanfeng Zhang

Junfeng Zhang

Haiyan Zhou

Renguang Zuo

Jacob Zwart