Yeah, it's the SF author - he's collaborated previously with John Baez, as for example at https://golem.ph.utexas.edu/category/2009/10/girih_by_egan.html https:

Yeah, it's the SF author - he's collaborated previously with John Baez, as for example at https://golem.ph.utexas.edu/category/2009/10/girih_by_egan.html https://golem.ph.utexas.edu/category/2009/10/girih_by_egan.h... where you can see the link to the applet goes to Egan's site at http://www.gregegan.net/ http://www.gregegan.net/ or on the paper http://arxiv.org/abs/gr-qc/0208010 http://arxiv.org/abs/gr-qc/0208010 co-authored by Egan, Baez and J. Daniel Christensen (referenced in Egan's wikipedia entry.)