I knew of his work at Lawrence Livermore National Lab (where he worked for over 60 years), but it was only after he died (in 2015 at age 96) that I learned that he was Markie's dad. It just totally blew my mind.

He was a beloved guy, an incredible scientist, and he lived an interesting life. He worked in the lab four days a week until a few days before he died. He got nine patents after turning 90.

He also played an important role in WWII
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In a 1992 Lab oral history with then-Lab archivist Jim Carothers, Post explained the situation: "The problem was that the Navy Lab at San Diego had developed this very special FM sonar gear. They had sent it out, just built in the lab, and all of sudden it was to be put in the submarines and run, and they did not send any technical person with it. So all we had were just the instruction books on this stuff."

Post was then sent to Guam to train the submariners to use the FM sonar gear. "That was an amazing, intense experience. We worked essentially 24 hours a day.

"Their lives were dependent on whether this gear worked. There was no way they could go into that inner sea without this gear. There was no way they could get through if this gear didn’t work."

Post and others put together a paper of technical hints for the submarine technicians, how they could repair certain items, what spare parts could be used, etc.

"The mission was marvelously successful," Post said. "I had a report from the guys when they came back through Pearl Harbor. They didn’t go back to Guam. One of the subs had gone through the mine fields, and had scraped cables on both sides. They had gone right through – here’s a mine, here’s a mine, and they had gone right down between them scraping the wire cables. That was because they could see the mines with the sonar."