I met Leary briefly around 1990 or so, just after seeing him debate G. Gordon Liddy on 'The State of the Mind vs. The Mind of the State' at my college. It was a small school, and not terribly culturally rich, so there were really only 50 people or so at the open reception afterward. All I remember about the meeting is getting him to sign my pack of Camels and asking him what he was working on currently.
He grinned and talked vaguely about "how popular those little hand-held video games are becoming" and how there was "technology available to teach geometry and other high mathematics, physics, history, and ethics subliminally" through the devices. He followed this by saying that he was spending some time with "a Japanese company" that was interested in developing the idea.
About a month later, my roommate 'accidentally' threw away that signed pack of cigarettes. And a few months later, both Nintendo and Sega came out with new hand-held game systems.