Frank Conniff (born August 30, 1956 in NYC, NY, USA) is best known as TV's Frank, Dr. Clayton Forrester's be-spitcurled sidekick on MST3K. Along with his on-screen persona, Frank was also a writer for the show. Frank's duties for the show also included picking a vast majority of the movies featured on the show. Frank also reportedly found many of Coleman Francis' movies hysterical and so they were all featured on the show. Some of Frank's least favorite movies include: End of Days (with Arnold Schwarzenegger), Green Lantern, Sucker Punch and Mamma Mia! 
Frank was also a member of the crew of Cinematic Titanic, riffing on bad movies alongside fellow MST3K alumni.
Conniff has appeared in the films God Bless America and Darkstar the Motion Picture (based on the previously-released video game project in which Conniff had also appeared). Conniff also wrote and performed satirical bits for the second and final season of FX Network's political sketch show Totally Biased with W. Kamau Bell. Conniff also frequently posts to his Twitter and FaceBook pages, which are often politically-charged.
In a 2012 stand-up comedy act for Top Story! Weekly, Frank revealed that he had been raised Catholic but no longer was of that religion. Instead of being an Atheist, he chose to put his belief in a fictional God. Frank also revealed that he had been sober for 27 years.
In fall of 2014, Frank appeared as the title Frankenstein's monster-based character in the music video comedy short The Frank along with other MST3K members. Later that same year, Frank, Trace and Joel appeared during a short which had them recounting the highlights of their personal experience with Thanksgiving and it was shown in-between the bumpers for Turkey Day '14.
In 2015, Frank began appearing in the traveling live movie-riffing show The Mads Are Back, with Trace Beaulieu. Frank and Trace appeared at the RiffTrax Mystery Science Theater 3000 Reunion live event in 2016 and the 2017 Summer Shorts Spectacular. They also contributed to the tag-team RiffTrax of Batman v Superman: Dawn of Justice in 2017.
In 2016, Frank Conniff began co-hosting the podcast Movie Sign with the Mads, along with Trace Beaulieu and Carolina Hidalgo. That same year, he published a book entitled Twenty Five Mystery Science Theater 3000 Films That Changed My Life In No Way Whatsoever. He followed that book in 2017 with new books Cats V. Conniff and How to Write Cheesy Movies.
Frank performs occasionally as a stand-up comedian. He produced and co-starred in a long-running live comedy show in Los Angeles called Cartoon Dump. He is a frequent contributor to John Fugelsang's political radio program. Frank has also written and performed in several original audio plays released in podcast format under the title Podcast 90.
- Gooch - The Side Hackers
- Winky's Mom (voice) - Manhunt in Space
- Tom Servo - The Giant Gila Monster DVD special feature "host segment".
- "I’m from New York City. I’d moved to Minneapolis in 1985 to go into drug rehab. I ended up staying and doing stand-up comedy. Basically, I was a very unknown stand-up comedian when I got on Mystery Science Theater."
- "I’ve never gotten any residuals or royalties from the show, or any money from merchandising. But that has never been a bone of contention with me, because Mystery Science Theater was my first TV show. I’ve always been totally cool with that."
- (on the difference between geeks and nerds) "I think a nerd gets beat up, and a geek gets beat up and then goes and watches an episode of "Buffy the Vampire Slayer." 
- (on his assigned task on selecting the bad movies for the show) "I think I was given the job because everybody else was busy with other stuff. [We looked for] a movie that's really bad but at least watchable and with a somewhat of a plot..." 
- (on his favorite so-bad-it's-good movie) "A movie from the sixties called The Oscar with Steven Boyd and Elke Sommers is my all time favorite bad movie."