The modern PKM movement has been shaped by a relatively small group of thinkers, authors, and tool builders. This article surveys the most influential figures and their contributions.
Historical Foundations
Niklas Luhmann (1927-1998)
German sociologist. Created the original Zettelkasten — a physical system of ~90,000 index cards that powered his extraordinary output (70+ books, 400 articles). Luhmann described his slip box as a "communication partner" that surprised him with connections he had not planned. His system is the direct ancestor of modern Zettelkasten Method practices.
Vannevar Bush (1890-1974)
American engineer who described the "Memex" in his 1945 essay "As We May Think" — a hypothetical device for storing, linking, and retrieving personal information. The Memex is considered a conceptual precursor to hypertext, the web, and Tools for Thought.
Modern Thought Leaders
Sönke Ahrens
German academic and author of "How to Take Smart Notes" (2017), the book that brought Zettelkasten to a mass English-speaking audience. Ahrens translated Luhmann's method into a practical workflow for researchers, students, and knowledge workers. His key contribution: making Zettelkasten accessible and demystifying the three note types (fleeting, literature, permanent).
Tiago Forte
Creator of Building a Second Brain (BASB), the CODE framework, and the PARA organizational method. Forte has arguably done more to popularize PKM as a mainstream concept than any other individual. His cohort-based course (since 2017) and book (2022) have introduced hundreds of thousands of people to deliberate knowledge management. His emphasis on creative output over academic rigor differentiates his approach from Zettelkasten purists.
Andy Matuschak
Former Apple engineer and Khan Academy researcher. Creator of the Evergreen Notes concept. His public working notes (notes.andymatuschak.org) serve as both a demonstration of his ideas and one of the most influential Digital Gardens. Key contributions: concept-oriented note naming, the principle of continuous note development, and research into memory systems (mnemonic medium).
Nick Milo
Creator of Linking Your Thinking (LYT) and the LYT Kit for Obsidian. Milo's contribution is the Maps of Content (MOC) concept and the "idea emergence" framework. His YouTube channel and community have trained a large cohort of Obsidian users in emergent note organization.
Bob Doto
Author and Zettelkasten practitioner who focuses on the creative and literary applications of the method. Author of "A System for Writing" (2024). Doto brings a humanities perspective to a field often dominated by tech and productivity voices, emphasizing that Zettelkasten is fundamentally a thinking tool, not just an organization system.
Community Figures
Maggie Appleton
Designer and developer who created the most widely-referenced visual guide to digital gardens. Her illustrated essays and garden (maggieappleton.com) have shaped how the community thinks about public note-sharing and visual knowledge representation.
Conor White-Sullivan
Founder of Roam Research (2020), which catalyzed the modern Tools for Thought movement by popularizing bidirectional links and block-level references in a note-taking context. Even as Roam's market share has declined, its conceptual influence on the entire TfT category is undeniable.
Ivo Velitchkov
Knowledge management thinker who bridges systems thinking and PKM. Contributes perspectives on complexity, emergence, and organizational knowledge that enrich the predominantly individual-focused PKM discourse.
Eliott Meunier
French PKM practitioner and content creator. Active in the Obsidian and Zettelkasten communities, bringing French-language PKM content and a younger generation's perspective.
Vicky Zhao
Content creator focused on making PKM concepts accessible through visual explanation and storytelling. Her YouTube content has introduced many newcomers to Zettelkasten and connected note-taking.
Anne-Laure Le Cunff
Neuroscientist (PhD, King's College London) and founder of Ness Labs. Bridges neuroscience with practical PKM, mindful productivity, and lifelong learning. Author of "Tiny Experiments." Newsletter with 120k+ subscribers.
Steph Ango
CEO of Obsidian since February 2023. Shapes the product direction of the tool that underpins much of the modern PKM ecosystem.
Zsolt Viczian
Creator of the Excalidraw plugin for Obsidian and leading advocate for visual thinking in PKM. Author of "Sketch Your Mind" and runs the Visual PKM YouTube channel.
Eleanor Konik
Ran the Obsidian Roundup community newsletter (2021-2023), the essential weekly digest of Obsidian news. Also developed the Konik Method for organizing electronic notes.
Mike Schmitz
Behind Practical PKM. Runs courses, a PKM community, a starter vault, and co-hosts the Bookworm and Focused podcasts.
Nicole van der Hoeven
PKM YouTuber and writer. Active content creator helping bridge Obsidian and knowledge management for a broad audience.
Bianca Pereira
PKM researcher and YouTuber. Emphasizes mindset over tools and writing your own understanding of source material rather than just capturing highlights.
Theo Stowell
Creator of Parazettel, a PKM approach blending Zettelkasten Method and Building a Second Brain's PARA method. Runs the Fundamentalised channel.
Evelyn Chapman
Knowledge management coach focused on creators and lifelong learners. Tana expert offering courses and workshops on KM workflows.
Julien Gueniat
Creator behind Organisologie. Published multiple books on personal organization including "Le cerveau numérique" on Knowledge Management. Brings French-language perspective.
Key Points
- Luhmann created the original Zettelkasten; Ahrens made it accessible to a modern audience
- Forte popularized PKM as a mainstream concept through BASB
- Matuschak defined evergreen notes and pioneered the public digital garden
- Milo created the LYT framework and Maps of Content
- The modern PKM movement emerged from the convergence of these thinkers (2017-2020)
Open Questions
- Who will be the defining voices of the AI-augmented PKM era (2025+)?
- Is PKM becoming too personality-driven, with method loyalty replacing critical evaluation?
References
- Vault: Person notes for each practitioner listed above
- Key works: Ahrens "How to Take Smart Notes" (2017), Forte "Building a Second Brain" (2022), Doto "A System for Writing" (2024)