There was a time when I worked a lot on privacy, especially privacy issues surrounding transaction-based information (TGI). The last piece of that line of research received good reviews , the quote below being an example. The next step should have been a book; I chose to come to Sri Lanka to set up the Telecom Regulatory Commission instead. Privacy was a fast moving field at that time. I knew it would be too late to get into it, after the diversion in Sri Lanka.