Congress passed Section 504 of the Rehabilitation Act in 1973, mandating accessibility across all federally funded spaces. Four years later, the regulations needed to enforce it still hadn't been signed. The sit-in was not a demand for new legislation. It was a demand that the government honor a commitment it had already made in writing, as Hollywood Reporter noted this month.

In April 1977, Heumann led more than 100 disabled people into the San Francisco Federal Building and refused to leave. The occupation lasted 28 days, the longest nonviolent occupation of a U.S. federal building on record, per Disability Scoop. The Carter administration eventually complied and signed the regulations.

The protest was one chapter in a longer campaign. Heumann went on to play a central role in developing and ensuring the implementation of the Individuals with Disabilities Education Act, the Americans with Disabilities Act, and the U.N. Convention on the Rights of Persons with Disabilities, according to Disability Scoop. She has been called the "mother of the disability rights movement," per AP News.

The personal history behind the activism is striking on its own terms. Polio left Heumann unable to walk at age two; doctors advised her parents to institutionalize her. They refused and fought to get her into school instead. As an adult, New York's Board of Education denied her a teaching license on the grounds that she couldn't evacuate a building in an emergency. She sued, won, and became the state's first teacher who used a wheelchair, Disability Scoop reports.

The film draws on her bestselling memoir of the same name. Available reporting indicates it focuses on the 1977 sit-in rather than spanning her full biography, per Hollywood Reporter.

When Heder reached out to Heumann about adapting her memoir, Heumann's response cut straight to it: "I am making a movie about my life based on my book, and if you can meet with me by five o'clock today, you can be in the running," Deadline reported Heder as saying. Heder made the meeting. They spent two years developing the project together before Heumann's death in 2023 at 75.

Heder comes to this material with specific credibility. CODA, her 2021 Apple film about a hearing child of deaf adults, was the first Best Picture winner with a predominantly deaf cast. It also took home Best Supporting Actor for Troy Kotsur and Best Adapted Screenplay for Heder, according to Hollywood Reporter. That film proved something the industry had largely assumed wasn't true: disability-centered storytelling could find a mainstream audience and win the industry's highest recognition at the same time.

The script for Being Heumann, co-written with Rebekah Taussig, was built from protest footage, interviews with people who participated in the sit-in, and documentary material from Crip Camp, Hollywood Reporter noted. Heder also produces under her overall deal with Apple Studios, alongside David Permut, John W. Beach, Kevin Cleary, and Kevin J. Walsh, Deadline notes.

Ruth Madeley, a BAFTA-nominated British actress who has spina bifida, plays Heumann. The casting extends the approach Heder used on CODA: the actor at the center of a disability story has direct personal experience with disability, rather than it being a character detail applied after the fact, per Deadline and Disability Scoop. The supporting cast includes Mark Ruffalo, Dylan O'Brien, Rob Delaney, Jon Beavers, Ray Fisher, Daniel Durant, and Madeline Delp.

Note: Deadline spells the co-writer's name as "Rebekah Tussing"; Hollywood Reporter uses "Rebekah Taussig." This article uses the HR spelling pending verification.

TIFF's opening-night selection is the festival's most prominent programming statement. TIFF CEO Cameron Bailey said, "We're thrilled to open this year's festival with Siân Heder's inspiring follow-up to her Oscar-winning CODA," adding that Being Heumann "features an electric performance from Ruth Madeley in the story of Judy Heumann, a world-changing advocate for accessibility," per Deadline. Last year's festival drew 700,000 attendees, Deadline reported.

Other world premieres at Roy Thomson Hall include Prima Facie from British director Susanna White, starring Cynthia Erivo, and The Assassin(s) from Korean filmmaker Hur Jin-ho. The festival runs September 10 through 20 and this year includes an inaugural TIFF: The Market, Hollywood Reporter notes.

The 504 Sit-in's legal legacy is substantial. Its cultural footprint, outside disability advocacy communities, has not been. The most prominent treatment to date has been Crip Camp, a documentary. Narrative cinema is one of the main ways civil-rights histories cross into shared public memory, and the sit-in has never had a vehicle at this scale.

After Hollywood studios passed on submitting major titles to Cannes this cycle, Apple committed Being Heumann to Toronto as its headline fall entry, Hollywood Reporter noted this month. The release sequence, festival premiere to limited theatrical to Apple TV+, follows the same track CODA used to build from Sundance to Oscar night. That precedent is worth noting as context, not prediction.

The September premiere will show whether Heder has found the same balance she struck with CODA, where the politics were inseparable from the personal story and never felt like a lecture. If she has, Being Heumann won't just be a prestige awards entry. It could be the film that puts the 504 Sit-in in the conversation alongside the protests most Americans learned about in school, according to AP News.