We knew each other a little, and he was looking for a tech cofounder. I accepted. The "cofounder" title he offered me seemed shiny and respectable, now it almost feels misleading.
I am definitely working for a "business visionary", although he pays me decently and we have decent traction.
I wouldn't last a week at a tech company because I have huge troubles with authority and policies and rules etc. I've never had a "real job" in my life; always in not very interesting organizations (including academia) where my lack of discipline was tolerated.