Explained: In 'Being Heumann,' Siân Heder and Ruth Madeley channel the spirit of a disability rights pioneer

Siân Heder directed "Being Heumann" as her follow-up to "CODA"

Rehabilitation Act

A law that made accessibility a requirement of federal buildings but had gone unenforced until the 1977 protest forced its enactment

sit-in

A form of protest where demonstrators occupy a space and refuse to leave, as Heumann's group did at the HEW offices in 1977

CODA

Siân Heder's prior best picture-winning family drama about a deaf family, noted for authentic casting of deaf actors