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Reddit, we lost something. Can you help Sesame Street help figure out who played Gordon in our test pilot?(r/AskReddit)
There is a lot of Room 222 stuff out there, which would have been filmed about 1968-1969 I would imagine.
From the Room 222 Wikipedia Page
From the Amazon.com page for Room 222 Season 1:
In the Video promo for the DVD Set you can see multiple shots of Haynes
Edit 1: He was on 2 episodes of Batman that aired in March 1967. He appears at 5:05 on this YouTube Batman Clip