Zelniker appeared in the films
Pick-up Summer (1980),
Ticket to Heaven (1981),
Heartaches (1981),
Bird (1988),
Glory Enough for All (1991),
Naked Lunch (1991),
Queens Logic (1991),
Mercenary (1996) and
Snide and Prejudice (1997), and made guest appearances in the television series
The Littlest Hobo,
In the Heat of the Night,
Murder, She Wrote,
Profiler,
Strong Medicine,
The Dead Zone and
Millennium. He wrote the screenplay for the 1998 film
Stuart Bliss, in which he also played the title character.
Stuart Bliss was also produced by Zelniker, and won the Northampton Film Festival's Best of Fest Award in 1998. Zelniker wrote, produced, and directed
Falling, which won Indie Fest USA International Film Festival's Best of Festival Award in 2012. In 2013 he began teaching Acting for Film, Chekhov Technique and Performing Shakespeare at the Los Angeles Campus of the
New York Film Academy after teaching Acting for the Camera, Acting Technique and Shakespeare at the
American Musical and Dramatic Academy from 2004 to 2013. In 2018, Zelniker became a climate leader with the
Climate Reality Project, trained by former Vice President
Al Gore. He served as the Co-Chair of Climate Reality's Los Angeles Chapter from 2018 - 2021. He wrote, produced, edited and directed,
The Issue with Tissue - a boreal love story. a documentary about the little known, largely untold story of the boreal forest and the Indigenous Peoples who call it home.
The Issue with Tissue held its world premiere at Cinéfest Sudbury International Film Festival on September 18, 2022, where it was recognized with their Audience Choice Runner-up Award. Playing in theaters in Los Angeles, Toronto, Montreal, Marin County and Quebec City and at film festivals across North America,
The Issue with Tissue qualified for major awards' consideration, including being nominated for the 2023 Next Generation Indie Film Awards Best Documentary Feature. == Filmography ==