A film that will be shown at a film festival in Bergen County focuses on the lives of people who have autism.

Among them is Donald Triplet, who was diagnosed with autism in 1943.

“He was case No. 1,” says filmmaker Caren Zucker.

Zucker’s documentary “In a Different Key,” looks not only at Triplet’s remarkable life, but at the lives of others who have autism.

Zucker’s own son was diagnosed with autism about 25 years ago, inspiring her to bring autism to the forefront. The Tenafly resident says she hopes the film builds understanding.

“They can be friends with somebody who is different and it’s not so hard to have the back of somebody who isn’t exactly like them,” she says. “And that you get a lot out of life by doing that.”

“In a Different Key” is one of several films being screened at the Teaneck International Film Festival.

“All of the films that we showcase throughout the festival are there to inspire people toward making positive change and raising awareness on specific issues,” says Jeremy Lentz, the festival’s executive director.

In-person screenings are being held Thursday to Sunday, beginning with a documentary on famed choreographer Alvin Ailey. A series of virtual offerings will begin next week.

Zucker dedicated four years to put together “In a Different Key” and hopes its message can open hearts and change lives.

Ticket and schedule information can be found on the festival’s website.