A Nice Introduction to Blockchain Basics: POW; Delegated-POS, Bonded-POS; and PURE Proof-of-Stake
From Wikipedia:
Silvio Micali (born October 13, 1954) is an Italian computer scientist at MIT Computer Science and Artificial Intelligence Laboratory and a professor of computer science in MIT's Department of Electrical Engineering and Computer Science since 1983. His research centers on the theory of cryptography and information security.
Micali won the Turing award together with Shafi Goldwasser in 2012.
Micali has been on the faculty at MIT, Electrical Engineering and Computer Science Department, since 1983. His research interests are cryptography, zero knowledge, pseudorandom generation, secure protocols, and mechanism design.
In 2017, Micali founded Algorand, a fully decentralized, secure, and scalable blockchain which provides a common platform for building products and services for a decentralized economy. At Algorand, he oversees all research, including theory, security and crypto finance.
Micali is the recipient of the Turing Award (in computer science), of the Gödel Prize (in theoretical computer science) and the RSA prize (in cryptography). He is a member of the National Academy of Sciences, the National Academy of Engineering, and the American Academy of Arts and Sciences.
If you haven't read the below piece by Silvio Micali, you should.
https://www.algorand.com/resources/blog/algorands-core-technology-in-a-nutshell