Who is responsible
Excellia Education SASU (RCS Versailles 952 167 245), 5 Villa Auguste Renoir, 78290 Croissy-sur-Seine, France, which publishes the work of The Syntoria Institute. For any question about your data, write to sebastien@syntoria.co. I answer myself.
If you took part in the study
To produce this report I use the transcript of our interview, my notes, and public information from your professional profile, such as your location, years of coaching, credentials and previous career.
- Why: to carry out the research and share its findings with the coaches who took part, and more widely.
- Legal basis: my legitimate interest in conducting this research, in the frame of the interview you agreed to give.
- What is published: figures across the group, quotes signed with a first name and a professional title only, and a map that shows cities, never names.
- How long: as long as the research programme runs. When it ends, I delete the transcripts or make them anonymous.
You can ask me at any time to see what I hold about you, to correct it, or to remove a quote or your interview from the study.
If you sign up to the monthly letter
- What: your email address, and your participant code if you came through your personal link.
- Why: to send you the letter, once a month.
- Legal basis: your consent, given when you sign up.
- Where it goes: your address is stored in a list on n8n (n8n GmbH, Germany), I receive an email notification, and once a month I add new addresses to Substack (Substack Inc., United States), which sends the letter.
- How long: until you unsubscribe. Every letter has an unsubscribe link, and you can also simply write to me.
If you ask for one of the ten places
- What: what you enter in the form, such as your name, profile link, years of coaching, the kind of clients you work with, the story you have in mind, your goals, your email and your message, plus your participant code if you came through your personal link.
- Why: to read your request, choose the ten case studies and organise the work with you.
- Legal basis: steps taken at your request before we possibly work together.
- Where it goes: the form is provided by Tally (Tally BV, Belgium). I receive your answers by email.
- How long: if we do not work together this round, I delete your answers 12 months after the round closes. If we do, I keep them for the duration of the work, and invoices for the period French law requires.
If we work together, your client is interviewed too. They approve every word before anything is shared, and decide whether to be named.
Improving the page
To improve the experience of this page, some information about how it is used is observed, such as which parts are read. It is not used to identify you, and it is deleted within 2 months.
What any visit involves
To display the page, your browser connects to a few services, which therefore see your IP address:
- Vercel, which hosts the page and keeps short technical logs for security;
- Google Fonts, for the typefaces;
- cdnjs (Cloudflare) and jsDelivr, for the code that draws the map.
Who sees your data
Only me, the services named above for the part they handle, and the freelancers who help me produce the case studies (a copywriter and an assistant), for what that work needs. I never sell or rent your data.
Some of these services are based in the United States (Substack, Vercel, and the companies behind Google Fonts). They rely on the safeguards the GDPR provides for such transfers, such as standard contractual clauses.
Your rights
You can ask to access, correct or delete your data, to object to or limit its use, to receive it in a usable format, and to withdraw your consent at any time. Write to sebastien@syntoria.co. I reply within one month.
If you think your data is not handled properly, you can also contact the French data protection authority, the CNIL (cnil.fr).
Last updated: 8 October 2026