don't forget Steven M. Bellovin who's on that list and who was one of the inventors of the first Encrypted Key Exchange, a precursor to the Diffie-Hellman Key Exchange.
Martin Edward Hellman, electrical engineer, was born in 1945.
Richard Hellman started selling jars in 1912. No remote relation apparent. (Specifying just in case of doubt, especially for those unfamiliar with the brand.)
Hal Abelson, first name there, is from the computer science classic SICP book/MIT lecture series - https://groups.csail.mit.edu/mac/classes/6.001/abelson-sussm...