RIP.
Peter Allan Fields might not of been the most prolific Trek Writer, but pound for pound, I think he was the best.
I mean, look at his writing credits:
TNG:
Half a Life (Finally figured out how to do something compelling with Lwaxana Troi)
Cost of Living (Again, good character work on Lwaxana, and the only non-annoying use of Alexander in TNG)
The Inner Light (Do I need to say more?)
DS9:
Dax (Honestly kinda meh - his worst episode overall, though the weakness of Terry Farrell early on played a role)
Progress (A great early DS9 character work - probably would have been the best of Season 1 if it wasn't for...)
Duet (One of the best hours of Trek)
The Circle (Great middle episode in three-part arc)
Necessary Evil (The best episode of DS9's second season overall, and that's saying a lot, considering how many strong contenders there were)
Blood Oath (The episode where we start to "get" Dax, lots of fanwank (in a good way) and fun to boot).
Crossover (The only time DS9 did the MU and it wasn't totally hammy)
For The Uniform (A great episode marred only because of the out-of-character decision by Sisko to commit war crimes)
In the Pale Moonlight (Need I say more?)
The Dogs of War (The penultimate episode of the entire series, with plenty of fantastic moments).
Really, if he had just written The Inner Light, Duet, and In the Pale Moonlight alone he would have had a great legacy in Trek. But every episode he had a hand in was at least decent, and most were excellent.