You can e-mail me at paul (at) ganssle (dot) io.
I’m pretty friendly and don’t mind unsolicited e-mails from actual people, but I’m not interested in recruiting offers or any other sort of bulk or commercial e-mails.
I log in to LinkedIn so infrequently that the last time I tried, LinkedIn deemed it so suspicious that, despite my having both the password and access to the associated email, my account was immediately disabled.