WikidataCon 2025

Daniel Antal is an economist and data scientist working on the data problems of increasingly autonomous systems in the music and film industries. He has been active on Wikipedia for 20 years, is a heavy user of Wikidata, Commons, and Wikibase, and has been writing code since childhood. He is the founder of Reprex, a Dutch trustworthy AI startup focused on data curation, a Fellow at the University of Amsterdam’s Institute for Information Law, and Work Package leader for data infrastructure in the Open Music Europe consortium.

Head of Customer Success & Community Management @ OpenSanctions.org

PhD student in Classics, Wikimedian since 2012

Daniel Mietchen is a biophysicist interested in integrating open research and education workflows with the web. His research spans multiple scales and disciplines: from subcellular processes to whole organisms, from fossils to developing embryos, and from biodiversity informatics to mathematics and data science. He is particularly interested in how these diverse perspectives connect with sustainable development. With experience across many stages of the research cycle, Daniel has explored a wide range of practices in collaboration, sharing, and reproducibility. Beyond that, he has been an active contributor to Wikipedia and other Wikimedia projects for nearly twenty years, working to strengthen the ties between the Wikimedia and research communities, particularly through Wikidata.

I am a ComCom Manager for Wikimedia Deutschland

A female Librarian from Ghana, employed as the AfLIA's Program Officer and the Secretary to the Governing Council. Ms. Appiah's is interested in Indigenous knowledge, information Management, Digital literacy, public libraries and Development Agenda. She is also a student at the University of South Africa.

All relevant info about me can be found here: https://www.wikidata.org/wiki/User:Egezort

Data science, Wikimedian

Houcemeddine Turki is a Wikidata researcher, medical student, and computer science student from Tunisia. He is an active contributor to Wikidata, Wikifunctions, and open knowledge projects, with a focus on Arabic language resources, biomedical informatics, and linked open data. He has organized regional training events and published widely on knowledge representation.

I'm a Senior Product Manager for the Wikibase Reuse team

Jan has been a Wikimedian since 2006. Nowadays, his majority of edits is on Wikidata, but he contributes to Wikimedia Commons and Swedish Wikipedia a lot too. He is active in a number of WikiProjects and is a member of bunch of User Groups and Chapters. Besides the editing, he does a podcast about Wikipedia and sometimes also live streams when he edits.

I love turning complex data challenges into elegant software solutions. Currently hooked on mastering emerging technologies to solve real-world problems.I love turning complex data challenges into elegant software solutions. Currently hooked on mastering emerging technologies to solve real-world problems.

Jona is interested in the nonprofit world and in data, so it makes sense he focuses on nonprofit data. He does this on Wikidata and through his own platform, cividata.org. There you can get a clear picture of the nonprofit sector in different countries, including financial info and ways to contact the NGOs. It makes it easy to grasp the sector and use the data as a base for more research and studies.

Free culture activist. Member of Wikimedistas de Uruguay. Developer of the Paulina tool.

Lydia Pintscher is the Portfolio Lead for Wikidata. She works at Wikimedia Deutschland and has supported the Wikidata Community since the beginning of Wikidata. In her free time she contributes to KDE, a free software community, as the vice-president of KDE e.V.

Mateus Batista Santos is a Computer Science graduate who has dedicated his career to developing technological products in the third sector. Guided by his philosophy of Social Driven Development, he believes that the right technology combined with a good educational plan can transform the world.

As co-founder and Director of Technology at AletheiaFact.org, Mateus oversees the technology strategy, builds and leads a team of volunteers, and develops innovative solutions that address misinformation through technology.

Mateus architected and developed most of the AletheiaFact.org platform. What began as a side project has evolved into a full NGO co-founded with Brazilian journalists, now in beta phase fostering an independent community of fact-checkers in Brazil.

With his multilingual abilities and extensive experience in large-scale web applications, Mateus brings both technical excellence and a deep understanding of user needs to the fight against misinformation, creating positive social impact through thoughtful technology solutions.

Researcher (Digital Humanities) and Wikimedian

Wikimedian since 2019.

Nkem has served as the Head of the public library system in Anambra State Nigeria (2009 -2015), a Director of Nigerian Book Foundation(2016-2018)where she currently sits as a member, Board of Trustees. Presently, she works with AfLIA(African Library and Information Associations and Institutions) with headquarters in Accra, Ghana as the Director, Human Capacity and Training.
She has been the project lead for AfLIA’s projects with OER Africa, NBA South Africa, Book Aid International and Wikimedia Foundation. In 2022, she won the global award of the Wikimedian of the Year 2022, (Newcomer category). She had won the Dr. Victori aOkojie award on Advocacy and promotion of Library services in 2015. She won the Wikimedia User Group Torchbearer Award in 2023. She had championed and drove a book donation to Langata Women Prison, Library, Kenya in 2019 and to Warri Prison library also in 2019. She is an alumnus of WIPO (World Intellectual Property Organization) and serves in the UNESCO/IGF OER Dynamic Advisory Group.

Peter F. Patel-Schneider is in the post-economic phase of his research career. Peter's research interests center on large-scale representation of knowledge and information. He has made long-term contributions to description and ontology logics, particularly the W3C OWL Web Ontology Language. He developed large portions of OWL and its predecessor DAML+OIL, as well as SWRL, the Semantic Web Rule Language, and RDF, the W3C language for representing data in the Semantic Web. Peter is currently working on finding and fixing issues in the Wikidata Ontology and benchmarking SPARQL engines on Wikidata.

Philippe Saadé is the AI/ML Project Manager at Wikimedia Deutschland, where he's developing a Vector Database on Wikidata's data to enable semantic search and support the open-source AI community in building projects with Wikidata's open data. He studied computer science at the Lebanese American University in Lebanon and completed a Master’s in Informatics at the Technical University of Munich in Germany, specializing in Machine Learning and Natural Language Processing.

Raisha Abdillah is a Project Lead and Wikidata contributor based in Jakarta. She leads the team behind Lexica, developing tool for lexicographical data with a focus on accessibility, multilingual support, thoughtful design, and community-centered development, especially for contributors in underserved language communities.

Stanley Boakye-Achampong works with AfLIA, the continental association of library and information institutions and professionals in Africa, where he leads research and communications. He is also the Secretary to the Scholarly Publishing and Academic Resources Coalition (SPARC) Africa Management Committee, an IFLA Impact Trainer and a Climate Reality Leader. He has been contributing to Wikipedia and other Wikimedia projects since 2020, and he’s especially interested in Wikidata because of his love for research and data. Stanley helps organize the African Librarians Week, which brings librarians together every year to add and improve references on Wikipedia as part of the #1Lib1Ref campaign. He has trained and supported many librarians across Africa to contribute to Wikipedia, Wikidata, and Wikimedia Commons. Stanley has also been part of several Wikimedia Foundation-funded projects run by AfLIA, including Wikipedia in African Libraries, Promoting Open Knowledge in African Libraries through Wikidata, and Integrating Wikimedia Projects into African Libraries (IWIPALE).

Tamiris is a journalist and educator with a Master’s degree in Media Communication from FAAC/Unesp and an MBA in Digital Business from ESALQ/USP. Currently a PhD candidate in Brazilian Literature at FFLCH/USP, with a research residency at Université Paris-Sorbonne (France), and has also participated in two editions of the ALAIC Summer School (Bolivia and Colombia). Co-founder and CEO of AletheiaFact.org, a Brazilian initiative recognized by the Supreme Federal Court’s Program Against Disinformation and finalist of the WSIS Prizes 2025 (UN/UNESCO). Through AletheiaFact.org, she coordinates training programs to democratize fact-checking in partnership with public universities in Brazil and abroad, including Unesp and the University of Beira Interior (Portugal). Also co-leads, with Mateus Batista Santos, the National Committee for the Democratization of Fact-Checking. Her international trajectory includes the Comprova Project residency and participation in Global Fact 9 (Oslo, Norway), consolidating her role in advancing information autonomy and global cooperation against disinformation.

Linguist and specialist for hearing training in Patients with cochlear implants at the Centre for Hearing and Communication - Praxis Hanik.

I earned my PhD in 2024, studying Wikidata and cell types at USP, and then spent six wonderful months as Wikimedian at the Biodiversity Heritage Library. I love studying nature, building software, and organizing knowledge in computational structures. I find the life sciences exquisitely beautiful and believe in open knowledge as a tool for happier lives.