The one director that DePatie-Freleng studio had that I'm curious about is George Singer (1923-2002). I don't know much about his animation career as whole, but before his brief stint at DFE he worked at Jay Ward, and after that he seemingly spent many years at Hanna-Barbera. In 1988-89 he was a producer on Film Roman's Garfield and Friends.
His career at DFE was short. He was only credited on five Inspector films (The Pique Poquette of Paris, Sicque! Sicque! Sicque!, That's No Lady - That's Notre Dame, Unsafe and Seine, and Le Cop on Le Rocks), plus the Saturday Morning shows The Super 6 and Super President. It's a shame his time at the studio was short because the Inspector shorts he directed were among the funniest in the series. His shorts had more broad animation compared to the rest, and the timing is snappier than much of the Chiniquy-directed entries.
Here's one of the shorts he did, The Pique Poquette of Paris. This cartoon has an example of what we in the internet age refer to as the Brick Joke. This is when an element of a joke is delivered in the beginning, but before the punchline comes something else kicks in and the element introduced is promptly forgotten. In the end, after everything else is said and done, the joke element finally returns, delivering the punchline. This was used a few times in the Road Runner shorts directed by Chuck Jones, where a failed trap by the Coyote would return later in the cartoon after the audience had forgotten about it to deliver a blow to the Coyote.
I believe this was Singer's first Inspector short, and he did a good job, althoug the funniest from him is either Sicque! Sicque! Sicque! or That's No Lady - That's Notre Dame.