Gene Roddenberry, of course. How many other writers have spawned a TV series that lasted more than 40 years?

From the frontiers of science to the end of our galaxy, Gene opened up the universe more than any other sci/fi writer in history.

I remember well my top ten favourites of all the episodes:

1. The Squire Of Gothos
2. Metamorphosis
3. City On The Edge Of Forever
4. Spectre Of The Gun
5. Encounter At Farpoint
6. Best Of Both Worlds
7. Measure Of A Man
8. The Offspring
9. Remember Me
10. All The "Q" Episodes

The whole medieval/religious concept of "heavens above" and "hell below" changed with Gene's viewpoint of high tech civilizations in a high tech universe. Our loss is the future's gain.