Sanjeev Arora is a renowned computer scientist and professor. He was born in India and holds a Ph.D. in Computer Science from the University of California, Berkeley. Arora is primarily known for his significant contributions to the field of theoretical computer science. One of his most notable achievements is the development of the PCP (Probabilistically Checkable Proofs) theorem, which has had a profound impact on the study of computational complexity. The PCP theorem deals with the concept of probabilistically checkable proofs, allowing for efficient verification of the correctness of a proof without having to examine it in its entirety.