My supervisor is too busy to find an external examiner for my PhD thesis, so the job will probably fall to me. I know all the academics who may potentially be an internal examiner, but I don't know any academics outside of my own institution. To be honest, I do not know where to begin.
My area is computer science, but it overlaps with medicinal fields as well. There are presumably any number of people who would have some expertise in some part of my research, but very few who would cover all of them.
I feel that cold calling academics who are some way related to my research (maybe ones that I am citing in my thesis) asking if they will become my external examiner is a particularly poor strategy, but it is the only one that is apparent to me at the moment.