Abstract: A huge thank you to our reviewers for their advice and guidance on OPO volume 43. Quite simply, we would not have a journal without you. These individuals perform an outstanding job for little or no reward for the substantial amount of time that the task entails. Having high-quality, peer-reviewed journals relies on the selfless nature of people willing to put in the time, and I want you to know that it is greatly appreciated. As an additional reminder, there is also a mechanism for reviewers to receive credit for their hard work through the Web of Science Reviewer Recognition Service, which allows you to maintain a record of your reviews (without any breach of confidentiality). This can be especially beneficial when applying for academic promotion. Please note that in order to meet the publisher's deadline for the November 2023 issue, this list had to be compiled by 15 September 2023, and so those who submitted reviews after that date were omitted. My apologies for the omission, but rest assured that you will be included in the 2024 list of reviewers. Given the very significant time and effort that is required to provide high-quality reviews, in 2017 the Editorial Board decided to acknowledge reviews that were exceptional. This acknowledgement is given to only about 5% of the reviews that we receive. The following individuals provided reviews that were considered exceptional. Noel Brennan, USA Charles Campbell, USA Ngozi Chidi-Egboka, Australia Morrice Elliott, Canada Liat Gantz, Israel Satish Gupta, India Siofra Harrington, Ireland Reut Ifrah, Israel Safal Kanal, USA Keziah Latham, UK Rebecca Leighton, UK Claudia Lunghi, France Ivan Marin-Franch, Spain Raul Martin Herranz, Spain Allison McKendrick, Australia William Ngo, Canada Maria Nilsson, Sweden Sonia Ortiz-Peregrina, Spain Yi Pang, USA Tony Redmond, UK Simon Skalicky, Australia Lawrence Stark, USA Whitney Stuard, USA Walter Wittich, Canada Marwa Abdellah Samuel Abokyi Jennifer Acton David Adams Prakash Adhikari Stephanie Aguilar Kwadwo Akuffo Aixa Alarcon César Albarrán-Diego Julie Albon Jose-Manuel Alonso David Alonso-Caneiro Azam Alvani Ana Amorim-de-Sousa Andrew Anderson Heather Anderson Roger Anderson Nicola Anstice Marc Argiles Reiko Arita Pablo Artal Paul Artes Kofi Asiedu George Asimellis Rashima Asokan Lisa Asper David Atchison Gerd U. Auffarth Michael Bach Helen Baker A Balaji Ganesh Stefan Bandlitz Jinhua Bao Sergio Barbero John Barbur Brendan Barrett Karthikeyan Baskaran María José Bautista Llamas Ian Beasley Sharon Bentley Shrikant Bharadwaj Matilda Biba Alison Binns Jeewanand Bist Sayantan Biswas Alex Black Caroline A. Blackie Ralf Blendowske Alex Bowers Arthur Bradley Tasanee Braithwaite Noel Brennan Hetal Buckhurst Bang Bui Mark Bullimore Catey Bunce Pilar Cacho-Martínez Ahmet Cakir Begoña Calvo Charles Campbell Melanie Campbell Peter Campbell Stephanie Campbell T. Rowan Candy Genis Cardona Andrew Carkeet Nicole Carnt Gonzalo Carracedo Francisco Cavas Ranjay Chakraborty Neil Charman Riccardo Cheloni Angela Chen Junhan Chen Xu Cheng Ngozi Chidi-Egboka Holly Chinnery Kai-yip Choi Amy Chow KaMan Chun Elise Ciner Karl Citek Kenneth Ciuffreda Christopher Clark Daniel Coates Catherine Collin Alejandra Consejo Jeffrey Cooper Stacey Coulter David Crabb Rosalind Creer MaryAnn Croft Michael Crossland Stephen Dain Robertas Damasevicius Anna Dastiridou Pinakin Davey Leon Davies Rebecca Deffler Mahesh Dev Jose Diaz Christine Dickinson Sally Dillehay Elena Diz-Arias Alberto Domínguez-Vicent Bradley Dougherty Soheil Doustkouhi Lesley Doyle Mitchell Dul David Edgar Asieh Ehsaei Keshia Elder David Elliott Amany El-Shazly Ann Elsner Fergal Ennis Bruce Evans Tanya Evans Fengzhou Fang Sidney Faria-e-Sousa Miguel Faria-Ribeiro Beatrix Feigl Andresa Fernandes Paulo Fernandes Achim Fieß Kerry Fitzmaurice Colin Flowers Sergejs Fomins Kelly Frantz Andrew Freedman Tim Fricke Eric D. Gaier Tapan Kumar Gandhi Francisco Javier Gantes-Nunez Liat Gantz José Vicente García-Marqués Stuart Gardiner Alex Gentle Fatema Ghasia Neema Ghorbani-Mojarrad Sena Gocuk Blanka Golebiowski Alexander Goncharov Jose Gonzalez-Meijome Ariela Gordon-Shaag Vijaya K. Gothwal Lyle Gray Peter Greene Lynn Greenspan Andrzej Grzybowski Jeremy Guggenheim Satish Gupta Bharat Gurnani Robert Harper Síofra Harrington Wendy Harrison Kerryn Hart Andrew Hartwick Satoshi Hasebe Hassan Hashemi Shirin Hassan Gareth Hastings Amithavikram Hathibelagal Ji He Natasha Healey Rebekka Heitmar Robert Herber Robert Hess Ruth Hogg Shelley Hopkins Fraser Horn Anna Horwood Hosein Hoseini-Yazdi Jeff Hovis Patricia Hrynchak Yi-Ting Hsieh Jinhai Huang Alex Hui Young Hoon Hwang Niall Hynes Reut Ifrah Mohammed Iqbal Rafael Iribarren Elizabeth Irving D Robert Iskander Ebrahim Jafarzadehpur Divya Jagadeesh Isabelle Jalbert Mo Jalie Nomdo Jansonius Matt Jaskulski Jason Jedlicka Erin Jenewein Hong Jiang Aaron Johnson Chris Johnson Pete Jones Susie Jones Lisa Jones-Jordan Monica Jong Sven Jonuscheit Michael Kalloniatis Himal Kandel Hyungoo Kang Dinesh Kaphle Henryk Kasprzak Stephanie Kearney Lisa Keay Mehdi Khabazkhoob Safal Khanal Brett J. King Sander Kneepkens Emmanuel Kobia-Acquah Pete Kollbaum Carina Koppen Anna Kosovicheva Dimitrios Koutsimpogeorgos Marjean Kulp Mukesh Kumar Sheela Kumaran Toshihide Kurihara MiYoung Kwon Carla Lança Keziah Latham John Lawrenson Rebecca Lee Rebecca Leighton TszWing Leung Shi-Ming Li Meng Lin Zhong Lin Rachel Linderman Gareth Lingham João Linhares Julie-Anne Little Hu Liu Jan Liu Nicola Logan Norberto Lopez-Gil Linda Lundström Claudia Lunghi Angelica Ly Yingyan Ma Rute J. Macedo-de-Araújo Richard Madonna Alexis Malkin Edward Mallen Fabrice Manns Ruth Manny Iván Marín-Franch Raul Martin Herranz Reece Mazade Julie McClelland Sara McCullough Myra McGuinness Allison McKendrick Langis Michaud Helena Mariavan Minderhout Giovanni Montesano Michael Moore Ian Morgan Priya Morjaria Ann Morrison Orla Murphy Donald O Mutti Maria Muzyka-Woźniak Thomas Naduvilath Derek Nankivil Jason Ng William Ngo Tracy Nguyen Debora Nickla Ewa Niechwiej-Szwedo Vinay Nilagiri Maria Nilsson Daniela Nosch Augustine Nti Michael Ntodie David O'Brart Brett O'Connor Kelechi Ogbuehi Jaeryung Oh Sonia Ortiz-Peregrina Sara Ortiz-Toquero Lisa Ostrin Olga Overbury Onur Özalp Prema Padmanabhan Teele Palumaa Yi Pang Eric Papas Shahina Pardhan Olavi Parssinen Bhavina Patel Konrad Pesudovs John Phillips Jack Phu Emily Pieterse David Piñero Sotiris Plainis Maureen Plaumann JanRoelof Polling Dmitri Poltavski Joan Portello Suan Hui Pu Heiko Pult Thomas Raasch Jeff Rabin Hema Radhakrishnan Dharani Ramamurthy Rajiv Raman Viswanathan Ramasubramanian Jacqueline Ramke Petra Rausch – Koster Ayeswarya Ravikumar Sowmya Ravikumar Scott Read Tony Redmond Beatriz Redondo Marielle Reidy Laura Remón Nicole Ross Jos Rozema Nicholas Rumney Barbara Ryan Raman Sah Jonathan Salim Padmaja Sankaridurg Premnandhini Satgunam Kathryn Saunders Frank Schaeffel Mitchell Scheiman Hanne-Mari Schiøtz Thorud Katrina Schmid Lauren Schneider Muriel Schornack Hartmut Schwahn Dirk Seidel Maayan Semo Rakhee Shah Amy Sheppard Einat Shneor Lindsay Sicks John Siderov Michael Simpson Neeraj Kumar Singh Sarah Singh Lawrence Stark Katharina Sterenczak Torsten Strasser Whitney Stuard Raj Suryakumar Catherine Suttle Mark Swanson William Swanson Barbara Swiatczak Nóra Szentmáry Qing-Qing Tan Deanna Taylor Swee Chai Teoh Louise Terry Swapnil Thakur Larry Thibos Benjamin Thompson Willem Tideman Chi-ho To J. Daniel Twelker Thomas van den Berg Hilde van der Aa Ruth van Nispen Fuensanta Vera-Diaz Pavan Verkicharla Mathijs Vervloed Algis Vingrys Valldeflors Vinuela-Navarro Gianfrancesco Virgili Suresh Viswanathan Brian Vohnsen Heidi Wagner Sandra Wagner Maria Walker Mengxin Wang Abigail Webb Ann Webber Barry Weissman Yasmin Whayeb Mark Willcox Walter Wittich Emily Woodman-Pieterse Jason C. Yam Geunyoung Yoon Nayuta Yoshioka Xiaoying Zhu Xiaohua Zhuang