Hi there!
I’m having great time with Blueprints.
I’ve tried to find out who was the very first person to inspire Epic team to create this system and started to work on it.
I know that this kind of work is usually team effort where many people needs credits, but in many cases the spark comes from one person.
So, who is that person/group, does anyone know? I think that they need more credit, definitely would love to see twitch stream about this 
I’m not sure whether it’s a specific person, UE3 had a similar system called Kismet, but it was build using UnrealScript so it wasn’t as advanced and wasn’t as good with performance, so it’s likely that Blueprints was developed based on doing something similar straight from C++
Node base programming has come quite some time before Blueprint is invented, eg in one popular shader programming tool (I cant remember the name now)… so the inspiration largely come from such popular (and therefore proven) tools.
Visual (or node-based) programming has been around a surprisingly long time. While I can’t find exact sources, I know it’s been around since at least the mid '90s, and I think Microsoft actually tinkered with it for things like Visual Basic as well. Here’s a video on some of the earliest usages: https://youtube.com/watch?v=AEkweKSdnHM
About halfway through the video you’ll see flowchart-like programming tools on a Mac as well. Pretty interesting stuff!
I vote for Chuck Norris as inventor of blueprints.
And those of us who used UE2 could trace the evolution of some component in that engine, into UE3 Kismet. So, yeah, it’s an evolution.
as per my best knowledge first node based code was used to build apps. which was “MIT App Inventor” they first used it to bypass java code for android mobile. it’s exact same like unreal blueprint.
But unreal Blueprint is now Very Powerful with almost no limitations.