Stephen T. Walker recently died. He was the founder of the pioneering Trusted Information Systems, a prime force behind the establishment of the NCSC (now the Commericial Solutions Center, but also the producer of the Rainbow Series), and he was the recipient of the first National Computer Security Systems Award  His obituary lists his many notable accomplishments and awards. Steve was a major influencer (and mentor) in the field of cyber security for decades.

I only recall meeting Steve once, and I am poorer for not having had more contact with him.

If you work in cyber security, you should read his obituary and ponder the contributions that have led to the current state of the field, and how little we have credited people like Steve with having had a lasting influence.