Today I was contacted by someone at work. She graduated school with me and our 20 year reunion was coming up. Why did she contact me at work? It was the only way they were able to track me down. I was included in promotional material by name. She told me I "was the hardest to track down"and I had to smile.
This is just a small anecdote about privacy practices and their real life impact (and how your employer can undo all of it, I guess)
Hunting down someone and calling them at their place of work is the dick here. Thats crazy. Leave people alone if they are hard to find. Someones privacy isnt someone elses sherlock holmes moment.
OPs invader sounds like someone who peaked in HS and cant let it go.