Professor Rivest is an Institute Professor at MIT. He joined MIT in 1974 as a faculty member in the Department of Electrical Engineering and Computer Science. He is a member of MIT's Computer Science and Artificial Intelligence Laboratory (CSAIL), a member of the lab's Theory of Computation Group and a founder of its Cryptography and Information Security Group. He is a co-author (with Cormen, Leiserson, and Stein) of the text, Introduction to Algorithms. He has worked extensively in cryptography, and is perhaps best known as a co-inventor (with Adi Shamir and Len Adleman) of the RSA public-key cryptosystem. He is a founder of RSA, Verisign, and Peppercoin. He has research interests in cryptography, computer and network security, algorithms, voting security, climate change, and, most recently, contact tracing (exposure notification).