Hiromichi Mori is a person. He is from Japan, which is a country in Asia. Mori is known for being an architect, which means he designs buildings and structures.
Imagine playing with blocks, where you stack them on top of each other to make a tall tower or a big castle. That's a bit like what an architect does, but on a bigger scale. They think about how to make a building look good and work well for the people who will be using it.
Mori has designed lots of buildings in Japan and other countries too. Some of them look really different from what you might see in your own town. Like one building in Japan that looks like a big wave! It even has a pool on the roof that fits the shape of the wave. Cool, right?
Overall, Hiromichi Mori is a very talented architect who comes up with amazing designs for buildings that people use for living, working, or having fun.