Geez, I saw "Richard Kline" in the opening credits and told myself to keep an eye out for him, and then I got so engrossed in the show that I forgot! But you're right - he was the HR guy.
Yep, that was him. Boy he looked a lot older. I don't know if he grayed naturally or if the show made him look that old. He and John Ritter were the same age, I thought, on "Three's Company" and John Ritter didn't age like that.