Where did the original series get its science from?

Gene had certain contacts. He had a contact at The Rand Corporation, a very famous place in science and warfare. He had an advisor who would check every idea to see whether it's feasible or believable. The man's name was Harvey Linn Jnr. [He] tried to get the truth of science without sacrificing the science of playmaking.

He was consulted heavily during the first and second pilots, and rather heavily during the first season of the series. But thereafter the need for his advice seemed to fade and the studio being stingy, as usual, rather forced us to remember to forget Harvey Linn.