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  "markdown": "Co-founder, CMO and COO.\n\n- LinkedIn: https://www.linkedin.com/in/jonas-ducker-37460bb3/\n\n## What Jonas builds\n\n- [ROOK](https://www.anchorterminal.com/tools/rook.md), graded C, 55.1/100, in Health records \u0026 wellness data. ROOK Connect, from Rookeries Development Corp., collects health data from wearables and phone health stores, normalises it into sleep, physical and body summaries and events, and sends it by webhook or a REST API. Co-founder, CMO and COO, researched 2026-10-28.\n\n## Works with\n\n- [Daniel Martinez](https://www.anchorterminal.com/people/daniel-martinez/), Co-founder and CTO\n- [Jose Esquivel](https://www.anchorterminal.com/people/jose-esquivel/), Co-founder and CQA\n- [Marco Benítez](https://www.anchorterminal.com/people/marco-benitez/), Co-founder and CEO\n- [Oscar Garcia](https://www.anchorterminal.com/people/oscar-garcia/), Co-founder and CFO\n\n## Questions\n\n### Who is Jonas Dücker?\n\nJonas Dücker is co-founder of CMO and COO.\n\n### What does Rookeries Development Corp. make?\n\nAnchor Terminal lists ROOK from Rookeries Development Corp.. ROOK Connect, from Rookeries Development Corp., collects health data from wearables and phone health stores, normalises it into sleep, physical and body summaries and events, and sends it by webhook or a REST API.\n\n### How are Jonas's tools graded?\n\nROOK is graded C, 55.1 out of 100, on Anchor Terminal's benchmark, which scores every listing against the same checklist.\n\n## Sources\n\n- https://tryrook.io/\n- https://tryrook.io/contact-us/\n- https://tryrook.io/about-us/\n\nThese are the people building the tools we list, named for their public role in the company or project behind a listing, from public pages, with the date it was researched. They don't work for Anchor Terminal (our own team is on the about page, /about/#author). We show public roles, public profiles and what the listing pages show, nothing private. To correct something, send an about or a photo, or have a page removed, write to privacy@anchorterminal.com.\n",
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