The most impressive personal website, I've ever seen, has got to be, hands down, Bret Victor's website — worrydream.com I'm including a Quora answer below, which I've written a few years back, because I think it should be included here 👇
I seriously doubt that I can be convinced that there is someone better than Bret Victor when it comes to interaction design.
Because, Bret Victor is much more about 'life' than he is about 'interaction design' or anything, and that makes him the best. In his own words:
The true way transcends the minutia of Skill. There is no "Technology". There is no "Design". There is only a vision of how mankind should be, and the relentless resolve to make it so. The rest is details.
This is the Way that I teach.
Now, watch this short video to get a feel of the kind of projects that he has worked on till now.
If you had to make your first and only choice on selecting something to watch/read about, from the video that you just watched (I hope you did!), I would suggest you to go with this talk: Inventing on Principle (http://vimeo.com/36579366).
He currently pursues his own independent projects, but once you know enough about him, you will come to believe that there is an unprecedented lot of depth in the statement that he makes in his resume.
I designed the initial user interface concepts for iPad, iPod Nano, and half a dozen experimental hardware platforms