Just to give credit where credit is due, the Content Repository and the CMS were definitely Karl G's babies (along with the templating system), but Stanislav Freidin did a huge amount of work on them.
Actually, the toolkit team and the WGBH project team should also be mentioned as instrumental to the creation of the CMS.
Last that I had heard Karl was still working in the field. He presented at a OSCOM conference last year.
I'll drop him a line and point him at this thread.