At one point I started a habit of reading so-called one-hour or short biographies - biographies in book form that could be read in an evening.

I didn't keep the habit very long, but of those that I read, I enjoyed:

All told I've read maybe 10 biographies. Of the long ones, I most enjoyed Steve Jobs by Isaacson. I got a quarter of the way through Titan many years ago, which I found enjoyable, but it contained more minutia than I tend to like.