The IHDS professional directory, 2010 to 2018

The captures, and the size of the roster

Counts are of names carried in the directory’s own per-person entries in each capture. The roster grew from 122 to 572 across the period.

What the comparison shows

The directory grew steadily, and it also turned over. Of the 122 professionals listed in the September 2010 capture, 69 were still listed in June 2018 and 53 were not. Growth and turnover ran together, which is what the aggregate establishes and the limit of what it establishes.

Two of the names that stop appearing belong to people this archive documents elsewhere, and in both cases the captures narrow the date to within about a year.

• Ilse Sendler. Listed in the captures of September 2010, June 2012 and June 21, 2013. Not present in the capture of September 20, 2014, or in any later capture read for this page. She is the figure associated with the Human Design Austria archive, the collection that preserved the founder’s email of May 10, 2008 and the licensing letter of August 5, 2010, both of which this archive relies on.
• Martin Grassinger. Listed through the capture of June 18, 2015. Not present in the capture of May 29, 2016, or later. He is the analyst whose own pages claim the first Human Design analyst licence issued anywhere; his account is carried in his witness dossier.

Register Neither entry is offered as evidence of a removal. Both are offered as dates: the last capture in which the school’s own directory carried the name, and the first in which it did not. The companion volume ZENO documents the institutional pattern these dates sit inside; the dates themselves are simply what the captures hold.

The directory as it stands, read on July 27, 2026

Because the captures stop carrying names after 2018, the only way to state the size of the current roster is to read the live directory. Both official directories were read in full on July 27, 2026, and the totals are these.

Set beside the captures, the school’s roster has roughly quadrupled since 2018, from 572 to 2,281. The business institute’s separate certification, which is the more expensive ladder documented in The Credential, carries 352 consultants, about one for every six of the school’s professionals.

Where the certified are

The distribution is the part the raw total conceals. These are the largest national blocs in each directory, out of 92 and 47 countries respectively.

Largest twelve and largest ten respectively, read July 27, 2026. The two directories are counted separately and a person certified by both would appear in each.

What the distribution shows The system’s documented history runs through Ibiza, the German-speaking countries and Taos. Its certified population no longer does. Russia is the largest single bloc and is ahead of the United States; Taiwan is third and Ukraine sixth. Germany and Austria together hold 177, fewer than Russia alone. The archive records the distribution and offers no account of why it looks like this.

A note on the directory’s own pagination

One incidental finding, recorded because it bears on anyone who tries to check this. The school’s directory serves its listings in pages of twenty and tells its own page control how many pages exist. That number is not consistent with the data behind it: the first page reports a total of fifty pages, later pages report a hundred and fifteen, and listings in fact continue past both. A reader paging through the directory in a browser reaches the end of the control before reaching the end of the roster.

This is reported as an observation about the page, not as a claim about anyone’s intent. It does mean that the published directory understates itself to the person reading it.

Where the record stops

The series ends in 2018 for a reason worth recording. From about 2019 the directory was rebuilt to assemble its listings in the browser rather than serve them as part of the page. The Internet Archive continues to capture the address, and those later captures are perfectly valid, but what they preserve is the empty frame of the directory rather than the names inside it. A capture from 2018 runs to roughly 1.6 megabytes and holds 572 people. A capture from 2026 runs to about 85 kilobytes and holds none.

The consequence is that the public record of who the school has certified was checkable in arrears until 2018 and has not been checkable since. That is a property of how the page is now built, and this archive records it as such rather than ascribing an intention to it.

Method

• Source: Internet Archive captures of the IHDS professional directory at ihdschool.com, listed in the table above and linked individually.
• Extraction: each capture’s per-person entries were read from the page, taking the name that follows the directory’s own repeated per-listing marker, so that headings, navigation and body copy could not be counted as people.
• Comparison: rosters were compared by name. A person who changed the name they list under would read as two people, one arriving and one leaving.
• Limits: the counts are of what a given capture holds. Captures are snapshots, not a continuous record, so a name absent from one capture and present in the next was listed at some point in between; the windows given above are bounded by the captures either side of them.

The live reading of July 27, 2026

• Source: both directories serve their listings to their own front ends as structured data, twenty at a time. The reading was taken through each site’s own interface, page by page, and counted.
• Counting: totals are of distinct listing identifiers, not of pages multiplied by page size. Paging returned about thirty-nine repeated entries on the school’s directory, so the page arithmetic would have overstated the roster by that much. Country tallies are taken from the country each listing states.
• What was kept: totals and country tallies only. No names, images, contact details or identifiers were retained, and none are published. The reasoning is recorded in the data file that holds this census.
• Reproducibility: the directories reject requests made outside their own front ends, so this reading cannot be automated from a script and was not. Repeating it means reading each directory through its own interface again, which is the same route any reader has.
• Limits: a person certified by both bodies is counted once in each. A listing is evidence of a current listing and nothing more: it does not establish that someone is practising, and the directories carry their own disclaimers to that effect.

Elsewhere in the archive