I never met Irwin Scollar personally, but I corresponded with him several times years ago when I was using WinBASP, the Windows update to the earlier command line version of BASP (Bonn Archaeological Seriation Program). He was extremely helpful and conveyed a delightful personality, even via email.
WinBASP, as the name implies, was great for seriation. It had other nifty features and other statistical operations. My favorite was a module that plotted histograms of whatever variable you chose for different sites on a map. It was quite impressive – and fun – at the time. It seems you can still download it, and maybe it would run in a pre-Windows 10 emulation: http://www.baspsoftware.org/basp1.html
I’m sure I have a copy of it on. 3.5 inch floppy somewhere…