Creator of Mozilla rr, of which Ciro Santilli is a huge fan of!
He quit Mozilla in 2016 to try and commercialize an rr extension called Pernosco.
But as of 2022, he advertised himself as part of "Google Research", so maybe that went under, sample source: archive.ph/o9622. TODO when did he start? There's apparently an unrelated homonym: www.linkedin.com/in/rob-ocallahan/
He's apparently very religious, and very New Zelandish, twitter.com/rocallahan auto-describes:
Christian. Repatriate Kiwi.
Terry A. Davis and D. Richard Hipp come to mind. One is tempted to speculate a correlation even, the proportion amongst systems programmers feels so much higher than in other areas of programming! Maybe it is because you have to be a God to do it in the first place.
Video 1. Robert O'Callahan interview by Toby Ho (2022) Source.