Good to see you out and about.
I wanted to be sure to bring to your attention that he was an active poster at a physics/chrystallography mail list.
There archives are accessible online; I haven't explored them, and I presume that they are waaaaaaaaay over my head.
(IUCr) Commission on Crystallographic Computing: Re: Lachlan Cranswick is missing
"Lachlan has always been a very frequent poster on this list and knows many of you personally. If you have had any contact with him recently, on Monday or especially at any point since Monday, please let us know. It does not appear that he had plans to leave the area, but if anybody knows anything that may be relevant to finding him, or especially of his plans for that week please let the police know."
Thanks for the info. Guess we have another one to add to our “dead/missing scientists” list.
Creepy and very troubling. Way too much of this is happening with no answers.