There are a lot of Bullet Journal iterations out there today but Ryder Carroll is the originator of the practice. According to the video he introduced in 2013, he calls it “an analog system I devised that will help track the past, organize the present, and plan for the future.”
I’ve dabbled in his Bullet Journal a bit but haven’t nailed it just yet. Thankfully, Carroll is coming out with a new book (pre-order here) to further explain the process and how it helped him become consistently focused and productive. I’m looking forwarding to reading it so I can get better at prioritizing what’s important despite all the stuff that comes into our brain each day.