Carlisle Adams
Canadian cryptographer, the C in CAST, who then spent decades on the less glamorous job of making PKI actually work.
Adams did his doctorate at Queen's University under Stafford Tavares, and the CAST design procedure carries their initials. He took it to Bell-Northern Research and Nortel, where CAST-128 became one of the stock ciphers in PGP and GnuPG. He wrote RFC 2144 (1997) for CAST-128 and RFC 2612 for CAST-256, which entered the AES competition but was cut before the final round.
After that the focus shifted to the plumbing around the keys. At Entrust he co-authored several PKIX standards, including the timestamping protocol in RFC 3161, and wrote Understanding PKI with Steve Lloyd. He later became a professor at the University of Ottawa.