TR was still at KPOI during my stay, which basically was my junior year in high school (at McKinley). 1964-65. He was the PD and doing morning drive. Jacobs had left. I'm not familiar with Mel Lawrence, although KPOI was constantly doing some high-visibility promotions, so I suspect he may have still been around. I remember a big box discount store opening which KPOI made sound like a branch of the Vatican was coming to town.
I lived in an apartment two blocks from the station, and a couple of jocks lived in the same apartment complex as me. Getting to hang with these guys....even on a very occasional basis....was very instrumental in developing my interest in radio. They were very gracious and supportive. Especially Steve Nicollet, who was doing evenings and a weekend day shift. I never met TR, however.