I've been listening to the audiobook version of Walter Issacson's biography of Einstien.[0]

If you're looking for a book, I can recommend this one.

Bonus: Read "The making of an atomic bomb" by Richard Rhodes [1] before reading the Einstien biography. This book sets up the context and several key characters really well (and Einstien lurks in the background).

Also - Randall Munroe's explanation for the general theory of relativity[2] is a must read.

[0] https://www.amazon.com/Einstein-Life-Universe-Walter-Isaacso...

[1] https://www.amazon.com/Making-Atomic-Bomb-Richard-Rhodes-ebo...

[2] https://www.newyorker.com/tech/annals-of-technology/the-spac...

Einstein: His Life and Universe by Walter Isaacson - http://www.amazon.com/Einstein-Life-Universe-Walter-Isaacson...