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Evolutionary biologist (author of SLiM), amateur photographer, liberaltarian, birder.
SLiMhttps://messerlab.org/slim/
Photographyhttp://www.cloudphotographic.com
Stick Softwarehttp://www.sticksoftware.com
Home pagehttp://benhaller.com
The star trek future we have at home:

I want to explain a few things and then it might be clearer why UK trans people are upset.

In 2001 I married my wife, Sylvia.

In 2005 I started medical transition. For the state to recognise this I had to submit to standards of "care" which were humiliating, degrading and which placed me at risk of violence.

But I did it "by the book"

As I did it "by the book", the NHS agreed to reregister me as female, which makes sense because my anatomy now is.

In 2007 I had sex reassignment surgery. This had to be signed off by two mental health professionals, "by the book", and it was.

In 2008 I applied for gender recognition. This involved signing a statutory obligation, stating that I promised, BY LAW, to live fully as female for the rest of my life. As this was done, "by the book", the government promised that it would treat me as such.

Its first act as treating me as female was to annul our marriage because it was a same sex marriage and those were not allowed.

The state then reissued my birth certificate, correcting the "mistake" it had originally made when it recorded me as male, "by the book".

In 2009 Sylvia and I married for the second time, in a same sex civil partnership, which was done "by the book", because the state regarded me as female and I was bound by law to be female.

In 2013 we married again, because the state decided that same sex marriage was in fact allowed after all. This was done, "by the book". Despite having been married for 12 years, we had to submit ourselves to individual questioning to prove our relationship was genuine, "by the book".

In April of 2025 the state turned round and told me that I had been mistaken. That it never regarded me as female. That I was male the whole time. That the marriage it annulled because it was a same sex marriage was never a same sex marriage (but it stays annulled). That the civil partnership in 2009 never really happened because "opposite sex" civil partnerships were not allowed in 2009.

And that the legal obligation I have to live as female for the rest of my life, which I signed and gave up my marriage for, is still in effect but also if I keep following it, I am breaking the law and subject to arrest. As it's still valid, presumably if I don't keep following it, I am also breaking the law and subject to arrest.

The law of the land simultaneously requires me to be both a man and a woman and if I do either then I am breaking the law and subject to arrest.

At every stage I did what the state asked me to, even though it was humiliating, degrading and cruel.

And it kept moving the goalposts, and reneging on the agreements it made, whilst continuing to hold me to them even when they are now mutually contradictory.

Apparently this is "all my fault" and I should have known that this would be the consequences of my actions when I started medical transition 2 decades ago.

Perhaps you can now appreciate why we are upset?

SLiM 5 paper, on the new support for multiple chromosomes and full genomes in SLiM, is now out on bioRxiv. https://doi.org/10.1101/2025.08.07.669155
Howdy campers! SLiM 4.2 (and then 4.2.1) has been released. There are several new features in it that I've wanted to do for years. See the 4.2 release notes at https://github.com/MesserLab/SLiM/releases/tag/v4.2 – but update to 4.2.1 so you get the bug fix it contains! https://messerlab.org/slim/
Release Version 4.2 · MesserLab/SLiM

Hi folks! SLiM 4.2 has just been released. This is a major point release with some new features that I've been wanting to do for a long time. It should preserve backward compatibility with SLiM ...

GitHub
Hi all! There will be a SLiM Workshop in Queretaro, Mexico, on February 5-9, 2004 (less than two months from now). Please see this post for details: https://groups.google.com/g/slim-announce/c/D2pOUe-sGLw
Workshop at Querétaro, Mexico, February 5-9, 2024

Hi all! SLiM 4.1 is released – a new version of the eco-evolutionary simulator I work on. I'm excited! https://groups.google.com/g/slim-discuss/c/9P3KoPEYpDg
SLiM 4.1 released

Hi all! Here's my talk at Evolution 2023, on Multispecies Modeling in SLiM 4: https://bit.ly/evo2023slim. There's a bit of difficulty with the PowerPoint slides at the start, but after that it went pretty smoothly I think. Check it out if you're curious, and feel free to boost, repost, share the link, etc. :-> (Click the link to start at the correct time; playing inside Mastodon seems to start at the start of the whole session.)
SSE Symposium 2023: The rebirth of comparative phylogeography (2 of 2)

YouTube
Hi folks! I'm announcing FOUR SLiM Workshops in Europe in the spring of 2024: Stockholm, Sweden; Copenhagen, Denmark; Ancona, Italy; and Edinburgh, Scotland. Please spread the word! (Also, there is still space in the Harvard workshop at the end of August, 2023!) Details for the "SLiM European Tour" are here: https://groups.google.com/g/slim-discuss/c/NWu-GjhjO0Y/m/znXKSRpvBwAJ
[REVISED] SLiM Workshop "European Tour" in 2024: FOUR workshops!

SLiM Workshop at Harvard, August 28th to September 1st, 2023. Applications are open now. Biology peeps, please share! https://groups.google.com/g/slim-discuss/c/UDtAsNFlkiE
Workshop at Harvard (Cambridge, MA), Aug. 28 - Sept. 1, 2023

Announcing the first in-person SLiM Workshop since the start of the COVID pandemic! It will be held June 16–20, 2023, in Albuquerque at the University of New Mexico. That's immediately before the Evolution 2023 conference. For more information, including information about how to register, please see https://groups.google.com/g/slim-announce/c/RVZi9WH-OqE. The more publicity the better; please share this, tweet it, toot it, or whatever you do. Thanks!
Workshop at UNM in Albuquerque, NM, June 16-20, 2023