In the book Fields Medallists' Lectures by M. Atiyah, there is a short (4 pp.) article written by Jean Dieudonné where he succinctly explains the specific contr

In the book Fields Medallists' Lectures by M. Atiyah, there is a short (4 pp.) article written by Jean Dieudonné where he succinctly explains the specific contributions that made Grothendieck so famous, after a brief background on the state of algebra and its problems before him.